New to Boarding - what about when you "need" to leave boarding animals?

Hi All!

Brand new to being a rover sitter! Loving it so far though! I wanted to pick everyones brains on what they think is a reasonable amount of time to leave my dog with another boarder. Wanted to see what you all do if a need arises where you have to leave multiple dogs alone in your apt/house. Do you make sure one or both are crated? block them off in a way? etc.