Mine was off any where from 10 to15 mins. The only reason I know is I was cleaning the coop out when see got off and back on. She yelled at me every time I got near the nest. I check for eggs 3 times a day , diff. times and saw her off at the diff. times of the day. So times its just a quick off and get food/water other times they get off and dust bath, eat,drink, always poo when off. The other one I never saw her off but know she had been off. I could smell her.