I've got a lot of different town saves, and I'm thinking of trying challenges now for the first time. Most of my towns are set at epic length, so if I do a challenge requiring a different life span, my understanding is that changing the challenge town's lifespan option will change it for all the towns I've saved. Each time I switch from my "normal" towns to a challenge town or back I'd have to remember to change the lifespan option too, right?
To be honest, I'm not sure I'd remember to do that each time I switch, and that would throw off the challenge. How do you handle that?