From past experience, that's not really a worry. This is kind of a...

[Lance hums, trying to figure out how best to explain.]

It's a universe of its own, outside of whatever time and space we're usually from. If we go back home, we're generally popped right back to where we left. So even if the universe is about to implode back where you're from and you're the only thing stopping it, there's nothing to worry about at least in that regard.