Sonic: If we don't return in time, Elise will die on board Eggman's battleship.
Kung-Fu Jesus: What? If you don't return in time? What?! But... you can return any time you want, that's the thing, you can go back to whenever you want!
IlluminatusVespucci: People never seem to realize this when they have time machines.
[Prisoner Of Azkaban] treats time travel like this urgent thing: "We've made it to the past! Now we've only got a few minutes to go back and stop the dementors!" No you don't, you have as much time as you need. It's fucking time travel. If you mess up, just go back and try again. Of course there's time to wait, you've got a goddamn time machine. Do it tomorrow, do it in ten years. It's the least suspenseful thing imaginable, yet they treat it as the nail-biting climax of the movie.
— Darach McGarrigle, Cracked.com editor, 8 Classic Movies That Got Away With Gaping Plot Holes
"And how ironic is that, that there's a time limit to go back in time?!"
— The Angry Video Game Nerd, review of Mario's Time Machine for the Super NES
"It's a time machine, Superman. It doesn't matter how long it takes to fix. Just as long as it gets fixed."
CG: OK, LET ME JUST CHECK THE UNIVERSAL CLOCK WHICH KEEPS CONSISTENT TIME FOR ALL FRAMES OF REFERENCE AND ALL PLANES OF REALITY.
CG: IT'S HALF PAST YOU'RE A MORON.
— carcinoGeneticist, Homestuck
It is an abstraction weaving together the fortunes of otherwise perfectly disparate chronologies