Superpowers can be loosely broken down into those that are "on" all the time
such as Superman's super-strength, and those that need to be activated in some way by the character such as Superman's heat vision.
Hour of Power
, named for the Might and Magic
spell, is a special limitation placed on the latter type, in which the power only lasts for a certain time interval after being activated. This time interval is always
the same, no matter how many times a character activates it, and it's always an easy-to-remember amount of time, usually a round hour, but occasionally a number with some other significance. Expect lots of Race Against the Clock
plots, where the character comes perilously close to running out of time while in the midst of danger.
There's usually no explanation of why the limit exists, or why it's so specific. If it's magically imposed, it's not a big problem, since magic only needs to be internally consistent
. It's a little more egregious
when the powers are granted by Applied Phlebotinum
, especially if every other time limit has been broken
, or if it's clear that the creators don't use "Earth" hours
. Real Life
technology doesn't tend to have fully predictable running times, but fictional technology, apparently, has it all the time
Most of the time though, it is just useful for writers to create a sense of danger. The character is forced to be careful about how often to use their powers, and can be put in opposition to a sufficiently prepared villain. This one way to avoid the Sorting Algorithm of Evil
Compare Super Mode
Not to be confused with Pastor Robert Schuller's broadcast from the Crystal Cathedral.
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Anime and Manga
- Moldiver is a rare example of a time limit that isn't a round hour, or even a round minute. It's still meaningful, though: 666 seconds.
- The Evas in Neon Genesis Evangelion technically have exact-time battery limits depending on power usage, but are usually conveniently vague about said usage. Evas can fight much longer while still attached to an umbilical power cord, but they're less agile and much less cool-looking when doing so.
- Ichigo of Bleach could initially activate his Superpowered Evil Side safely for eleven seconds at a time before it started to take control of his personality. Recently, though, this limit seems to have been extended. Should he overdo it, it will go away by itself, apparently severely tiring him out in the process.
- Eleven seconds was the time he could keep his mask on when the diversion attack happened/he went to Hueco Mundo. When he first started being able to call on his Hollow side/mask at will, he couldn't even keep it on for eleven seconds and had to train. Seeing Orihime and Nel in danger from Grimmjow's attacks was what enabled him to keep it on for longer.
- The other Visoreds similarly have time limits for their Hollow masks, which vary from one to the next. Two of them have a limit of 3 minutes, which (in a reference to Ultraman) they claim is because they're "superheroes".
- In One Piece, the effects of Chopper's Rumble Ball last for exactly three minutes. He can try it a second time if the fight lasts longer than that, but he loses control of his transformations if he tries. And if he goes for a third, well... things just get bad.
- Luffy's Gear Third has a variation of this. While there's no set amount of time it lasts, when Luffy stops the technique, he changes into a chibi version of himself that's pretty much useless in combat; he stays this way for an amount of time equal to that he had just spent using Gear Third.
- Ban Mido of Get Backers can cause a person to hallucinate for exactly one minute (real time). He nearly always greets a person coming out of a hallucination with, "Exactly one minute. Have any bad dreams?"
- Tekkaman Blade turns into a mindless, berserk killing machine if he remains in Tekkaman form for thirty minutes.
- In Tokyo Mew Mew, Alto, actually Ryou in cat form, can only remain as a cat for fifteen minutes or get stuck like that forever.
- Oolong from Dragon Ball has shapeshifting powers that only work for five minutes before he changes to his default form. This is because he was kicked out of shapeshifting school before he could learn how to shift indefinitely
- In DBZ, the Fusion Dance introduced in the Buu arc lasts for half an hour, but if the fusion is powerful enough it can shorten the amount of time they have. In GT, for example, the fusion of Super Saiyan 4 Goku and Vegeta, Gogeta, is so immensely powerful that he defuses after only ten minutes.
- The Japanese anime version of Teenage Mutant Ninja Turtles has the title turtles able to transform into super versions of themselves, but only for 3 minutes.
- In the Pokémon Special manga, Mewtwo could only fight for three minutes at a time after he was caught by Blaine, thanks to some trouble with his cloning involving some Applied Phlebotinum and Blaine's cells. Any longer risks Blaine's life and tires Mewtwo out considerably.
- Yellow has a good number of powers, including heightening her Pokemon's level to a frightening point when under emotional stress. Using these powers, however, eats at her stamina like nothing else, and when she uses them too much, she falls into a sleep that cannot be externally disrupted no matter how inopportune the following situation.
- In the games, Regigigas is an inversion. Only 11 other Pokemon meet or exceed its 680 base stat total, and only two exceed its base Attack, but it has to suffer 5 turns of weakness to get the benefits.
- Can be negated entirely through the use of Gastro Acid, a move that disables a Pokémon's ability (which, as it turns out is what limits Regigigas).
- Gundam 00 has the TransAm system which, when activated, makes the Gundams turn red and go three times faster for a limited time. Afterwards, they operate at reduced power for some time (since TransAm releases all the stored power at once and it takes a while to build the stores back up). It's worse for the false GN Drive mecha in the second season, since they lack the power output and using TransAm shuts it down completely afterwards.
- In Naruto, Danzo has multiple stolen Sharingans embedded in his left arm. Using a technique called "Izanagi", he had 60 seconds of being completely unkillable for each eye he had, and he had 10 extra eyes, so this extended to a total of 10 minutes. He was ultimately beaten by getting his perception of time slowed down by a second.
- In truth, this battle strategy wasn't as practical as it was convenient. With most fights in the series being chaotic brawls, anything could have happened to cause Danzo to lose track of the time he had for each eye, and he had to keep checking the eyes like a watch in the middle of his fight with one of the most dangerous ninjas in the series.
- Madara also displayed this technique in Chapter 510. He claimed it was a "Perfect" version of the technique, but the only difference seems to have been that it lasts several minutes longer.
- Sage Mode uses up a lot of energy and can only be recharged by standing perfectly still, so it wears off quickly in battle. Naruto gets around this restriction by using his shadow clones to recharge for him.
- This seemed to be more because Naruto's jutsu took a considerable amount of chakra to use: At one point he thought to himself about having enough "nature chakra" for another Rasenshuriken, having already used one to destroy one of the Six Paths or Pain, after crushing another with a Rasengan, crushing summons with giant Rasengans, and another path with a dual Rasengan. In total, it's implied he only had enough to use the Rasenshuriken four times.
- Naruto's full-on Bijuu Mode only allows him 10 minutes at most to fight before it dissipates. This is because Naruto hasn't perfected it compared to Bee, who can stay in his Bijuu Mode for almost an entire day.
- In Freezing, the girls' superpowered, armored "Pandora" mode has a limit of three minutes, after which they can no longer fight for quite some time, meaning that this is a last resort only.
- Subverted in Super Dreadnought Girl 4946. Mana is told that it's okay to eat Tobita for a power boost as long as she spits him up within three minutes. In reality Tobita should have died the moment Mana swallowed him, and the three minute rule was a lie to convince Mana that she wasn't killing her boyfriend. The fact that Tobita actually survived was a surprise to everyone except Mana, and ever since then they kept the three minute rule simply because they have no idea about how long he can ACTUALLY survive.
- In A Certain Magical Index, Accelerator gains this limitation after his Heel Face Turn. Originally, he could use his Story Breaker Power to change physical vectors as often as he wanted, with no real limitations. Later, however, he can only use it for up to thirty minutes, and relies on a vulnerable transmitter to do it. He later manages to improve the device and make it more energy efficient.
- The powerful mage Cendrillon automatically loses her powers at midnight or sunrise, similar to her namesake: Cinderella. Unfortunately for her, she will also lose her powers if midnight or sunrise is simulated.
- Wild Tiger's Super Strength in Tiger & Bunny has a 5-minute time limit per activation, as does that of his partner, Barnaby. Midway through the series his powers get stronger but shorter lasting, whittling down to four minutes by the series finale episode, and one minute by the Where Are They Now epilogue with it looking quite likely he'll lose them forever. Unless there's another season, of course.
- Rurouni Kenshin: Shishio Makoto was once burned alive, damaging most of his sweat glands. As a result, he cannot fight for more then fifteen minutes, at which point he overheats and dies. In the final showdown, he goes over this limit and literally goes up in flames.
- Rosario + Vampire: Whenever Tsukune got injured, Moka would inject him with her blood to heal him. At first, this would grant him temporary vampire powers as a side effect. After awhile it gets subverted, because the blood starts to take a toll on his body, and the transformation becomes permanent, with consequences. He recovers somehow and keeps the powers, so this trope becomes redundant.
- Although, he's still at risk if his limiter is ever broken.
- As his name implies, Hourman's Super Serum only lasts for an hour; he uses the phrase "Hour of Power" quite often too. The villain Per Degaton, who can accelerate time, is naturally a Man of Kryptonite for him.
- The second Hourman Rick Tyler also had the ability to spend an hour in a timeless dimension with his father. This eventually ended when Rick was mortally wounded, and all the time was used up to save his life. The android eventually gave his life in Zero Hour instead of Rex Tyler, enabling father and son to return home.
- Android Hourman also had an Hour of Power, which gave him access to all sorts of cool time-manipulation abilities (just about the only thing he couldn't do was make his Power Hour last longer than 60 minutes.) This was actually a self imposed condition, prior to that he had continuous access to his powers. He limited himself to explore his humanity.
- The Green Lantern's Green Lantern Ring used to require charging every 24 hours, but this has gradually been changeed to more closely follow a "battery" model, where the charge depletion depends on the use of the ring.
- The Doom Patrol's Negative Man could separate his energy form from his body for 60 seconds at a time. He had to act fast; If he didn't return to his body in time, he would die.
- In one Thor story, his power had been halved, and a villain was beating the living daylights out of him. As a test, Odin granted Thor his full power for thirty seconds. Thor won. (Do not screw with someone whose titles include "god", no matter what they are the god of. If they're the god of something like "thunder" or "storms", don't even think it.)
- Originally, if Thor lost contact with his hammer for more than 60 seconds, he would change back to his human form. This limitation has since been removed, although it made a comeback when Eric Masterson, otherwise a normal human, became a replacement Thor by taking up the hammer.
- According to one X-Men source Rogue's power drain ability (in the comics) tends to last for about a 1:60 ratio—that is, for every second she holds it, she has what she took for 60 seconds. Life Energy and memories may work on a different scale, of course, and since it's possible for her to take powers permanently, this ratio breaks down the longer she holds on, but, well, A Wizard Did It.
- It was later revealed that the limits to her powers were psychological, not physical. After she was "reset" and her trauma-induced mental blocks restored, she could call up any previous power or memory she had absorbed at will, as well as be able to touch someone without draining them. That said, the 1:60 ratio was rarely outright stated to begin with, and it's very possible that later writers ever heard of it, so it's more likely just a non-definite exponential ratio.
- J2 of Marvel Comics 2 has a time limit on his transformed state that gradually gets shorter as his body matures and becomes better at using his powers.
- All-Star Superman has a formula that gives whoever drinks it Kryptonian superpowers for 24 hours. When Lex Luthor takes it, Superman uses a gravity gun to increase Luthor's personal gravity 500 times - which only manages to slow him down temporarily. Thanks to General Relativity, the gun also makes 'Luthor's' 24 hours run down a lot faster and his powers give out before he can finish Superman off.
- This is based on old devices Superman had in the Silver Age which could do the same.
- Darkman, as opposed to Ultraman, needs to get out of light within 99 minutes. After that, the synthetic skin he uses for his masks dissolves.
- The Animorphs had two hours before they had to "demorph" into human form, or else be stuck as an animal. Used as a major part of the plot (one of the main characters was stuck from the beginning of the series), but suffered somewhat from a Two of Your Earth Minutes Running Gag. It also appears possible for someone with high willpower to demorph just beyond the time limit, but with greater difficulty. Note: There are instances in which the time limit can be reset. One book has Cassie get trapped as a caterpillar, but her natural transformation into a butterfly resets the clock. Also, the Ellimist has the power to restore someone's morphing ability after they have been mode locked (though he cannot restore their natural "unmorphed" form, which remains the form they were mode-locked in).
- Inverted in ''The Stormlight Archive; by Brandon Sanderson. Shardblades can be summoned out of thin air, but it always takes ten of the owner's heartbeats to do it (meaning you get it faster if you're adrenaline rushing, nice feature for a weapon). In this case, it's not an exact time until the power ends, but an exact time until the power begins.
Live Action TV
- The Animorphs television series has the extreme Exact Time to Failure version: Ax is close to being trapped in human form, counts down the last few seconds to a nearby teammate, but is finally able to get away and has none of the difficulty changing back that the book versions had when cutting it close. This would suggest that changing back after 1 hour, 59 minutes, and 59 seconds is no different from changing back after five minutes, but changing back at 2:00:00 is completely impossible.
- Ultraman popularized this trope for live-action Japanese superheroes. His Bizarre Alien Biology makes the atmosphere harmful to him, but - depending on the iteration - he stores solar energy for three minutes, often marked with a "color timer" on his chest that goes from blue to blinking red as this runs out. Just about the right amount of time for an easily-budgeted Monster of the Week fight sequence in a 24 minute show...
- ...And then you have Ultra Seven, who doesn't seem to have this limit.
- From the same studio there's also Fireman, who cannot stay in his Agan form for more than 3 minutes due to sunlight being harmful to Agans. Also, Gridman is really hard on the computer that hosts him; three minutes is the limit before Explosive Overclocking takes place. Iron King is water-powered and burns through his supply in three minutes, demorphing. Basically, the overwhelming majority of giant hero series have the three minute rule, because the Ultra Series writers worked on most even if the series is not officially an Ultraman series. Either the chest or the helmet will always have the light that lets him know when time is short.
- There's the 70's superhero Kaiketsu Zubat, who explodes if he wears the Zubat suit for more than 5 minutes. Justified in-show as being a Super Prototype, finished by the guy himself even though it's out of his field. Worse, the time spent catching up with the villain counts (compare to the Ultras, who can extend their time by conserving power or shorten it by using too much at once. Three minutes sitting in a comfy chair, if you had one big enough, wouldn't be the same as three minutes of battle; not so Zubat.) so he barely has enough time before the indicator on his helmet makes a full rotation and his visor opens, signifying the shutdown that prevents 'kaboom.'
- The Makai Knights of Garo have exactly 99.9 seconds to fight in their armored forms before it runs out. They can choose to exceed the time limit if they want, but the results are... not pleasant.
- A version of this occurs in Stargate SG-1, where barring some Applied Phlebotinum (and for this show exceedingly rare applied phlebotinum—perhaps three or four times in the entire series), no artificial wormhole (i.e. Stargate connection) can be maintained for more than 38 minutes and a few seconds.
- However, the show never seems to treat this as a hard and exact deadline. It seems 38 minutes is a rule of thumb and that there may be a small variance each time (for instance, they usually compare the current time to the longest recorded time a gate has been been open in the past rather then to a hard deadline). Combine this with the very random length of time the gate can stay open and the gate deadline starts to feels more like a natural limitation of a gates energy capacity and reliable failsafe systems and less like a contrived exact time limit.
- Silver Ranger/Megasilver from Power Rangers in Space/Denji Sentai Megaranger had a transformation time limit of 2.5 minutes.
- And then got over it when the bad guys tried to exploit this. With lots and lots of research.
- The Storm Megazord/Senpuujin in Power Rangers Ninja Storm/Ninpuu Sentai Hurricaneger had a special form that lasted 1 minute before switching back (although as the series went on it went transformed for about 2 mins).
- The Engines from Engine Sentai Go-onger can maintain their large forms in our universe for 10 minutes before rusting.
- In Power Rangers SPD, Kat was given an expendable morpher for one episode to help her team which would only work for one hour.
- Faiz Axel Form in Kamen Rider Faiz only worked for 10 seconds before shutting down. While this seems short compared to some of the other examples on this page, keep in mind that this is 10 seconds of Super Speed.
- In Tokumei Sentai Go Busters, there's an indicator of how much of the superfuel "enetron" is being burned. When it comes to finishing a fight, faster is better, though they've got way more time than many of the other Toku examples on this list.
- Metroid Prime 3: Corruption has Samus' Hypermode, which actually has two timers: 10 seconds after activation, the Hypermode turns into Corruption, causing the meter to rise over time (as does being hit by certain attacks), and 25 seconds after activation, the mode is automatically turned off. To be fair, the second time limit actually makes sense as an internal safety measure of her PED suit.
- A number of powersets in City of Heroes have abilities along this line. The best example is probably the defensive powersets which frequently include an "uber-mode" power that renders the character nearly invulnerable for a few minutes but has a very long recharge time.
- At the Whateley Academy in the Whateley Universe, Dash has super-speed, super-strength, and Nigh Invulnerability. But it looks like he only has it for a matter of minutes, and can't call it up without a lot of effort ahead of time.
- Word Of God finally explained it: Dash is some kind of Energizer and can focus to make his body stronger and tougher and faster, but it only holds up for ten minutes or so, and it takes about that long for him to power up. After, he needs hours before he can do it again.
- Many of the SCP Foundation artifacts have specific hard time limits, although the round units are generally averted. For example, SCP 431 sets its wearer on fire after 22 hours and 17 minutes of being worn.
- The Omnitrix of Ben 10 has a time limit that is supposed to be ten minutes Earth time, but in practice differs from use to use... and becomes moot altogether once Ben is an adult with more complete knowledge of how to use the device.
- Roger Ramjet's proton pills gave him "the power of twenty atom bombs for twenty seconds".
- Superboy of Young Justice normally has Super Strength, Super Toughness, Super Senses, and super-leaping abilities due to being a half-human clone of Superman. In the episode "Agendas", Lex Luthor who is the donor of Superboy's human DNA gives Superboy patches called Shields. When Superboy uses one, it suppresses his human DNA, which grants him the rest of Superman's powers (Flight, Heat Vision, more Super Strength) for one hour. However, it also fills Superboy with rage.