History Main / YearInsideHourOutside

* ''LightNovel/TheHeroIsOverpoweredButOverlyCautious'': The unified spirit world, the realm of the gods, is a place where time moves a hundred times slower than in the mortal realms. Seiya takes advantage of this by training in the gods' realm to level up faster than if he trained in a mortal world.

* In ''LightNovel/LogHorizon'', Shiroe comes to realize this trope is in effect within the world of ''Elder Tales''. When ''Elder Tales'' was a game, one in-game day was two real world hours. Doing the math, Shiroe realizes that major dates in the world's history, such as the appearance of adventurers, coincide with real world events, such as the start of the game's open beta testing.

* In ''LightNovel/ModernMagicMadeSimple'', Koyomi travels to the past (sort of) by hooking herself up to a viewer, and spends several hours meeting a young Yumiko, obtaining the password she needed to get, and helping to defeat a revived evil mage. Back in the present, she was looking through the viewer for 23 seconds.

* ''LightNovel/SwordArtOnline''

* In ''LightNovel/TheLegendaryMoonlightSculptor'', when players connect to the VRMMORPG, the author describes the players as experiencing a time parallax. The game experiences time as flowing four times as fast. So while the game has only been released for a year after the story's introduction is done, the game itself has had four real years. This becomes more important as a media group is trying to edit footage from the game, and is unable to keep up with the "live" footage, having to frequently fast forward.

* ''LightNovel/TheReunionWithTwelveFascinatingGoddesses'':

** Marco continues using time-slowing devices in the sequel ''TheBoxes'', where it's remarked it seems like he never ages. It turns out he spends weeks at a time in the effects of slow time, so for him the last few years have only been months.

-->-- '''Mr. Popo,''' ''WebVideo/DragonBallZAbridged''

** "Don't Open Till Doomsday" starts in 1929, when a groom on his wedding night becomes trapped inside a box with a nihilistic alien who wants him to help destroy the universe. The groom refuses and winds up spending 35 years inside the timeless void of the box, remaining young while his bride becomes a crazy old woman.
** In "The Guests", an idealistic young drifter becomes trapped in a mansion which has been taken over by an alien brain who is studying humanity. Time doesn't pass inside the house, and NoImmortalInertia means the other people confined within (who have all been there for decades) ''can't'' leave.

* ''Series/RedDwarf'': In "Rimmerworld", the escape pod Rimmer was in ended up flying into a wormhole, which made it seem like he was on a planet for 600 years, while to the rest of crew it takes 6 hours to find him.

** In one episode of ''Series/StarTrekTheOriginalSeries'', Kirk and Spock have to go back in time to prevent [=McCoy=], who is out of his mind thanks to an accidental drug overdose, from changing history. They end up spending nearly a month in the 1930s waiting for the arrival of [=McCoy=], who is there for at least a day or so himself. After completing their objective, they re-emerge in their own timeline to be told that they had "only left a moment ago".
** ''Series/StarTrekTheNextGeneration'': In "The Inner Light", Picard experiences an entire lifetime as the Kataan astronomer Kamin in just 25 minutes. And he ended up with the same flute he liked to play in his dream state.

*** "Hard Time" has Chief O'Brien being sentenced to a lengthy prison sentence. On this world however, serving your time consists only of having artificial memories of experiencing it inserted into your mind; thus, he serves what seems to him a decades long sentence and then awakes to find only an hour or so had passed. This is made much worse by artifical memories of a cell mate; by necessity, O'Brien had befriended the false man.
*** In "Playing God," a small proto-universe is created inside the station. The crew quickly figure a way to destroy it only for Dax to find evidence life exists inside it. Kira is dubious there could be intelligent life after only a few hours of its creation. Bashir points out they have no idea how time passes in this proto-universe and thus, billions of years could have gone by already. The idea of slaying countless innocent beings means the crew have to find a new way to handle this proto-universe before it destroys them.

*** One episode ("Blink of an Eye") has ''Voyager'' fall into the gravity well of an enormous M-Class planet, the gravity and spin of which causes centuries to pass down on the planet's surface in only a matter of hours on the ship. Curiously, it's also one of the rare examples that examines the physical hazards to transversing such time dilations; when a group of astronauts from the planet manage to hook up to ''Voyager'', the stresses in the transition between their time bubble and that of regular space killed one of them and severely injured the other. A subplot involves the Doctor, a timeless, mobile computer program, going down to the planet for what's supposed to be a few seconds (a few days planet-time), only for the transporter to malfunction as they attempt to bring him back up, leaving him stranded for several hours ship-time. In planet-time, this is enough to make a life and ''family'' for himself. How in God's name a hologram fathered a son is quickly lampshaded and handwaved as "a long story".
*** In "Gravity", Tuvok and Tom Paris are trapped in a space sinkhole where time moves slower than on ''Voyager''. After being stranded for two months, Tom is disappointed that his girlfriend B'Elanna doesn't miss him more because for her, only two days have passed.
*** ''Year of Hell'' uses time travel and narrative conventions to compress a year long epic war into two episodes[[spoiler: [[ResetButton that, in the end]], [[TheStoryThatNeverWas never really happened]] anyway.]]

* In ''LightNovel/OnlySenseOnline'', the "Forest Camping Game" event of the titular {{MMORPG}} takes place in a special {{Cyberspace}} server in which the flow of time has been stretched by about 80 times. This enables the event to last for a week while only taking up 2 hours of real time.

* ''WesternAnimation/FinalSpace'': In the episode "The Other Side", the crew comes into contact with a time shard that separates the ship in half while losing Gary, Ash, and Fox in the process. Roughly six decades pass by with Little Cato and the others desperate to survive, [[spoiler:except it was only Little Cato who got pulled in having GoneMadFromTheIsolation from the years of solitude.]] By the time Gary and the others pull the rescue, there was only a span of a few minutes.

* In ''VideoGame/FireEmblemFates'', to protect their children, the main characters sent them into a PocketDimension, but it turns out that dimension runs on this trope and the kids come out from it aged up-in a few cases ''older'' than their parents.

* In New World Online the VRMMORPG of ''LightNovel/BofuriIDontWantToGetHurtSoIllMaxOutMyDefense'', one week within the virtual world is two hours in the real 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 Shinning Emerium 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.

* ''Wiki/SCPFoundation''

* In Pam Uphoff's ''Wine of the Gods'' series, there are dimensional phenomena called "bubbles" because to someone with the genetic ability to see into multiple dimensions, they appear as translucent bluish spheres. Anyone with the ability to see the bubbles can also grab them and carefully open a small hole in the bubble wall, at which point they can store objects or people (including themselves) inside. As long as the bubble is open, its inside and its outside are in the same dimension and time runs at the same rate. But once the bubble is closed, it is a separate dimension where time runs slower inside of the bubble than outside. The ratio is about a thousand to one, so that one second inside is about twenty minutes outside, and an hour inside is about forty days outside. These bubbles get used for all kinds of things, from storing food to escaping from enemies (duck into the bubble and close it, count ten seconds, and reopen it, and it's nearly three hours later; the people searching for you have long since given up and left). Some of the people with dimensional-manipulation abilities have also learned to adjust the time dilation ratio of the bubbles, taking it from the thousand-to-one default to a one-to-twenty ratio the other way: one hour inside the bubble takes only three minutes outside. This allows getting 8 hours' sleep inside a "fast bubble" while only 24 minutes pass outside.

* In ''A Star Shall Fall'' by Marie Brennan, the London faerie court uses Britain's shift from the Julian to the Gregorian calendar (which meant skipping eleven days) to build a room like this. Anyone who goes in and locks the door will come out eleven days later from the perspective of the outside world, no matter how long they view themselves as spending in it.

* In John Niven's book ''Literature/TheSecondComing'', a day in Heaven takes about fifty-seven Earth years. As such, when God goes for a week off in 1609 at the height of the Renaissance, he returns in 2011 to find the planet falling apart.

* In John Niven's book ''The Second Coming'', a day in Heaven takes about fifty-seven Earth years. As such, when God goes for a week off in 1609 at the height of the Renaissance, he returns in 2011 to find the planet falling apart.

* In ''Everneath'' by Brodi Ashton, Nikki goes with Cole to TheUnderworld, called Everneath, where he drains her LifeEnergy. It feels like they have been there for hundreds of years, but it ends up only being 6 months in Earth-time.

* In Creator/UrsulaKLeGuin's ''The Beginning Place'', heroes Hugh and Irene are able spend a week or so in the Evening Land while only being absent from their usual lives for a single night.

** The ''Series/StarTrekDeepSpaceNine'' episode "Hard Time" has Chief O'Brien being sentenced to a lengthy prison sentence. On this world however, serving your time consists only of having artificial memories of experiencing it inserted into your mind; thus, he serves what seems to him a decades long sentence and then awakes to find only an hour or so had passed. This is made much worse by artifical memories of a cell mate; by necessity, O'Brien had befriended the false man.
** In "Playing God," a small proto-universe is created inside the station. The crew quickly figure a way to destroy it only for Dax to find evidence life exists inside it. Kira is dubious there could be intelligent life after only a few hours of its creation. Bashir points out they have no idea how time passes in this proto-universe and thus, billions of years could have gone by already. The idea of slaying countless innocent beings means the crew have to find a new way to handle this proto-universe before it destroys them.
** ''Series/StarTrekTheNextGeneration'': In "The Inner Light", Picard experiences an entire lifetime as the Kataan astronomer Kamin in just 25 minutes.
** And he ended up with the same flute he liked to play in his dream state.

* The entire plot of ''LightNovel/AccelWorld''. The main characters duel in a full-dive [[{{Cyberspace}} virtual world]] where time is sped up by a factor of 1000. If you lose, you lose Points, if you win you gain them, and if you lose all of them the game deinstalls [[spoiler:and you lose every memory related to it]]. It takes ten Points to enter the Unlimited Field, where you can fight [=NPCs=] and basically stay as long as you want (since 45 minutes in real life equals about a month in-game). [[TimeAbyss The time the veterans have spent there is unknown, but it's unlikely to be less than a couple of decades.]]

* In ''[[https://archiveofourown.org/works/30488928/chapters/75186222 Rider Time Zi-O: Roze from Remnant]]'', [[WesternAnimation/{{RWBY}} Ruby Rose]] spends a whole year in the world of [[Series/KamenRiderZiO Sougo Tokiwa]], only four four days to have passed in Remnant when Ruby returns home.

* This effect is possible under the General Relativity. Physicist David Wiltshire estimated that due to the effects of general relativity, time passes about 38% faster in cosmological voids (large, empty pockets of space between galaxy clusters) than in the Milky Way. Time dilation from Earth's gravity well is measurable by atomic clocks and has to be taken into account by GPS devices to keep them accurate. An observer in the powerful gravity well of a neutron star or black hole can experience time diation to the degree seen with this trope. Time dialation is also experienced by anyone travelling a significant fraction of the speed of light, though science fiction stories that actually take this into account in their narratives are rare.

* Physicist David Wiltshire estimated that due to the effects of general relativity, time passes about 38% faster in cosmological voids (large, empty pockets of space between galaxy clusters) than in the Milky Way.

** After an [[Literature/TimeStreams accident involving a time machine]] on the island of Tolaria, there were pockets of differently moving time. Teferi fell into a slow-moving pocket of energy immediately after catching fire, causing him to burn for 40 years of real time. Meanwhile, a Phyrexian operative fell into a fast-moving pocket of energy, which allowed it centuries to build a Phyrexian army in just a few years of real time.

* ''Manga/MobPsycho100'': Mob sends his soul inside a girl that is possessed by the spirit of Keiji Mogami, then Mob gets tricked and gets placed in an illusionary world by Keiji with his memories altered. While the whole thing seemed like a whole six months for Mob, Reigen and Dimple claim that Mob was gone for about 30 minutes.

* In ''Webcomic/TheKAMics'', Doc Unopoculum of SMOG [[http://www.theduckwebcomics.com/The_KAMics/4919731/ spent ten years in a fast dimension one week]].
* ''Webcomic/{{Manifested}}'', a webcomic about a normal guy who gets the power to travel into any fictional world he desires. He first goes into the Spider-Man world and after spending a year in there, he managed to return to his own world and the mysterious person who gave him the power said that only an hour and a half passed outside.

** In his Franchise/CthulhuMythos short story "A Colder War", a US minisub returns after spending a couple of days traveling through a PortalNetwork set up by {{Precursors}}. The crew are dying of radiation poisoning and the protagonist notices they've also acquired grey hair and wrinkles.