my bunny mummies nested in their sleeping area, after 3 1/2 - 4 weeks the babies spent most of their time out in the main hutch with mummy, so I finally cleared it out as they were happy to sleep out front with mummy.. but I have 3 3 week old ones, and they still love their nest... not ready for it to go... my advice would be look to see when they stop using it all day, they you know they won't miss it!