Well, that jump is not impossible, you need the help of coyote jump, and, also, it's a very hard jump (we'd say the hardest) BUT ITS POSSIBLE! :3
Time travel is implemented on how much you spend down in hell, since one of the NPCS tell you that time goes exponentially there, depending on how much time you remain there, once you get out, you "time travel" to a different place. I hope this made things clear and if you voted wrong because of it maybe this cleared doubts and could make it a bit better in the results of your experience.
Thank you for your feedback! :)