Well, it seems like it could complicate time-keeping, with visitors having to keep track of the difference in rate in order to keep up with time "outside". Imagine missed meetings and dates, or being far too early and ending up waiting—or even turning up too early, getting bored, popping into a place with faster time, and then over-staying.
My Games and Asset PacksI always assumed that the people going into a "Empty Space"(a space without time, causing time distortions when leaving it and entering "Time and Space" spectrum once more) weren't the same people that entered it (meaning that the ones going in aren't returning back to their own timeline, but a parallel timeline almost identical to the one they left, while a different parallel-version of the people who went in came back out to the first timeline in order to keep universe stable, "Spirited Away Phenomena")
So thinking in the extend of the infinite parallel multiverse, it shouldn't be that much of a problem.

I've been reading SoYouWantTo.Write A Time Travel Story on here, and it's useful for my characters (only eight characters), but have come up against one problem:
I'm trying to work out how to use this sort of thing for comedy, but what's a good way to get this used for comic effect in a work? (my work is Lighter and Softer).