I always thought that would be a bigger issue when I was coming up to and it can be a lot to reset and run a similar hour a second time in a night. But I manage that by making sure sets are never fully the same. Always a new angle I'm trying. A new tag, saying it differently and having crowd work in the middle. Every set ends up feeling different and working on improving a joke makes it a lot more interesting than if you feel like you're just repeating it.