History Main / YearInsideHourOutside

* In [[https://www.fanfiction.net/s/14073644/1/ The Echo Ranger]]'' Tommy talks to and trains Izuku in the latter's dreams. The first time this happens, after a few hours Izuku becomes worried that his mom will find him passed out. Tommy reassures Izuku that time is different in there, and it has only been ten minutes in the real world.

** In the virtual reality program known as the Underworld, the setting for the ''Alicization'' arc, time flows at a much faster rate compared to the outside world, resulting in centuries passing inside in the space of weeks in the real world. The rate at which the time is accelerated varies- for example, the acceleration is stopped when Kirito contacts Kikuoka from inside the Underworld.

** The manga version of Dragon Ball Super gives Hit the ability to create this effect at will by changing the flow of time at different parts of the universe. As an assassin, he uses this "time lag" to increase the flow of time for his own personal space while slowing it down for everyone else, but even when focusing all of the slowing on Jiren, the strongest known mortal in all the universes, specifically, it only gives Hit a brief advantage before Jiren starts to move so fast that the lag might as well not be in affect. Also, [[spoiler: near the tail end of the Granolah Arc, Frieza reveals that during one of his conquests, he found a planet that had a chamber highly similar to the Room of Spirit and Time, and he trained himself for 10 years in this room, which is how he achieved his "Black Frieza" form, which enabled him to utterly own both Ultra Ego Vegeta and MAUI (Mastered Autonomous Ultra Instinct) Goku IN ONE SHOT.

** The manga version of Dragon Ball Super gives Hit the ability to create this effect at will by changing the flow of time at different parts of the universe. As an assassin, he uses this "time lag" to increase the flow of time for his own personal space while slowing it down for everyone else, but even when focusing all of the slowing on Jiren, the strongest known mortal in all the universes, specifically, it only gives Hit a brief advantage before Jiren starts to move so fast that the lag might as well not be in affect.

* In ''Manga/SoulHunter'', the BigBad has a Paopei named Sangashasshokuzu, which uses a series of small black snakes to trap people in a dark and empty dimension where one hour inside equals to a minute outside. Fortunately, all the heroes trapped inside have ways to pass the time avoiding SanitySlippage... except for one, who, to add insult to injury, is the last to be fred (and by the time he's out he's devolved into TheBerserker).

* ''VideoGame/{{Pikmin}}'': In ''VideoGame/Pikmin2'', no matter how much time you spend underground, no time will pass at all on the surface, which is explained away by the oddness of the planet's magnetic field. When underground areas returned in [[VideoGame/Pikmin4 the fourth entry]], it was changed so time there moves at a sixth of the speed instead.

** The Room reappears in ''Anime/DragonBallSuper'' when, in preparation for an inter-universal combat tournament, Goku and Vegeta spend three years/days inside training. [[spoiler:And if the Moro and Granolah arcs are anything to go by, the dimension has access points all across the Universe, not just on the Lookout.]]

** The Room reappears in ''Anime/DragonBallSuper'' when, in preparation for an inter-universal combat tournament, Goku and Vegeta spend three years/days inside training.

* ''VideoGame/Pikmin'': In ''VideoGame/Pikmin2'', no matter how much time you spend underground, no time will pass at all on the surface, which is explained away by the oddness of the planet's magnetic field. When underground areas returned in [[VideoGame/Pikmin4 the fourth entry]], it was changed so time there moves at a sixth of the speed instead.

* ''VideoGame/Pikmin2'': No matter how much time you spend underground, no time will pass at all in the daylight, due to the magnetic field below the surface of the earth.

* In ''LightNovel/NyarukoCrawlingWithLove'', Luhy Distone has a door in her apartment that connects to [[Anime/DragonBallZ the Room of Spirit and-]][[YouWannaGetSued *achoo!*]]. In the short story and OVA episode "How to Defeat a Kind Enemy", she spends one month (two hours real-world time) training Nyarko to become a MagicalGirl, mostly by [[DrillSergeantNasty channeling the spirit of]] Creator/RLeeErmey in ''Film/FullMetalJacket''.

** Averted in ''Progressive'''. [[CallForward Kirito wonders if something like that is in play in SAO]], and briefly hopes that it means that he and the other players haven't been trapped inside for very long, but realizes that this isn't the case.

** In Creator/GrantMorrison's "Crisis Times Five!" storyline, ComicBook/TheSpectre is tied down and trapped with a civilization on top of him. Zauriel and Green Lantern could free the Spectre... and kill all the innocent people. They jumpstart time so 'the world' comes to an end in about an hour. The aliens don't really figure it out, apart from noticing the Lantern and Zauriel-shaped statues in their lives.

* PlayedForLaughs in the short Italian story ''Topolino e la Spada di Ghiacciolo'' ("Mickey Mouse and the Sword of Popsicle", itself a parody of ''ComicBook/MickeyMouseAndTheSwordOfIce'') by Sio, where Mickey and Goofy believe that, during their days-spanning adventure, only one minute has passed in the real world. The last page reveals it was actually A MONTH ''and'' one minute, with Minnie and the police believing they went missing and still desperately looking for them.

* This was supposed to be how Lion-O would train in a pocket dimension in the DarkerAndGrittier ''WesternAnimation/{{Thundercats}}'' comic, spending seven years there while a day passed outside. Unfortunately, Mumm-Ra got to him first, and Lion-O emerged a day later to find seven years had passed outside.
* In Creator/MarvelComics, we have the Macroverse, which combines this and RipVanWinkle -- after ComicBook/SpiderMan and the ComicBook/FantasticFour visit, one generation has already passed there. When they return, they spend only a few hours, but on Earth, it was two months.
* ''Franchise/{{Superman}}'':
** In ''Superman vs. Muhammad Ali'' - see part of it [[http://scans-daily.dreamwidth.org/1217275.html here]] - Superman applied some phlebotinium called a Kryptonian Continuum Disruptor to create a boxing ring where an hour inside was about a minute outside, giving them two months instead of twenty-four hours to teach Superman how to box. Unfortunately, the aliens making them do this -- no, [[AliensMadeThemDoIt not like that]] -- clue in on it and interrupt them after only about two weeks.

** In ''Superman: Godfall'', Supes becomes trapped in the bottle city of Kandor, and finds that hundreds of years have passed since the last time he visited. The citizens, including Lyla, the Kandorian woman he marries in the storyline, don't realize he is "The Superman of Legend". After all, it has been several generations, and even [[FutureImperfect Supe's original messages of altruism, truth, and justice have been perverted by the citizens into stories of Superman subjugating the Earth as God]].
** In the 3-part (issues #57-59) ''Superman/Batman'' story called "Nanopolis", Superman is shrunk down to microscopic levels and helps the tiny civilization he finds there. Batman eventually joins him in an effort to rescue him, and Superman discovers that only a few hours have gone by in the real world while it's been months for him.
* A certain alien race of recurring {{Harmless Villain}}s in ''ComicBook/{{Invincible}}'' comes from an AnotherDimension in which time passes much faster than on the Earth where most of the action takes place. When they come to Earth, [[WeaksauceWeakness they age decades in minutes if certain protective devices are disabled]]. Later, [[spoiler:Robot and Monster Girl]] are accidentally transported to this dimension, but make their way back a few months later. Well, it was months from ''our'' perspective -- while the rest of the cast assumes it was "just" a few years to them, they were actually gone for [[spoiler:''thousands'' of years. They agreed to lie about the amount of time because they think their friends would be weirded out by the truth.]]
* In a ''ComicBook/DCComicsPresents'' story, a villain, who just attacked Comicbook/GreenLantern Hal Jordan in another dimension, then abducts Franchise/{{Superman}} just as he about save a man falling from a building. After defeating the villain, Superman is brooding that the man must surely be dead now. However, as Jordan guides Superman back, he says not to give up hope as dimensions often have different rates of time progression. In this case, the dimension they are leaving has a much slower rate and arrive back home just in time to save the falling man.

* The ComicBook/DisneyDucksComicUniverse "Reginella" arc by Giorgio Cavazzano features Queen Reginella's planet where a second is worth a day on Earth. It makes its inhabitants getting old in a few minutes when they venture onto Earth.

* In ''Literature/{{Worm}}'' [[spoiler: Khonshu]] actually weaponizes this. He can create fields of speeded-up time. Anyone caught inside is trapped and experiences decades in the space of seconds, inevitably starving and dying. Those outside get to watch their friends' desperate struggles and inevitable demise on fast-forward.
** Since he's ageless he can also place himself in a field to [[MundaneUtility speed up his natural regeneration.]]

* The afterlife in ''Fanfic/ResonanceDays'' has this going on. [[spoiler: Mami]] has been there for seven years, despite having died less than a month prior to the story.

* Works of Peter F. Hamilton:
** In the ''Literature/NightsDawn'' sci-fi trilogy, the Commonwealth has "zero tau" fields, inside which time is simply switched off -- except for the [[CosmicHorrorStory space zombies]] [[AnotherDimension from another dimension]], who still experience time inside, but since their hosts don't, it's effectively massive sensory deprivation torture to them. Just about the only way to exorcize folk unlucky enough to get [[DemonicPossession possessed]].

* Works of Robert A. Heinlein:
** In ''Literature/TheNumberOfTheBeast'', a universe spanning device also allows you to visit universes which experience time on an axis 90 degrees to our own. This means you can spend any amount of time there and no time will pass in your own universe. Unusually for this trope, the main characters' first idea when this ability is discovered is that they could make a business off it. (Selling a week not in the calendar to students with a final exam coming up...)
** In ''Literature/ThePuppetMasters'' Heinlein also featured a ''drug'' that could do this somehow.
** In ''Literature/TunnelInTheSky'' the same technology that allows for instantaneous interstellar travel enables people to create zones where time moves relatively faster or slower than the outside world.

* ''Series/UltraFightOrb'': The titular Ultra needs to train himself to defeat the Ghost Sorcerer, Reibatos, but time is running out. So his two senior Ultra comrades, Ultraseven and Ultraman Zero, decide to put him through training in Zero's Shining Field, a Golden Zone where time flows absolutely slowly. To outside observers maybe a few minutes have passed, but for the heroes, Ultraman Orb had endured ten years of training.

* Implied to have happened twice in ''WesternAnimation/DuckTales2017'':