I have a broody hen who was broody in May. She has decided to be broody again. I arrested her and threw her in broody jail, but the sly creature faked me out. Her behavior went back to normal after 3 days, so on Day 4 I turned her loose. Out with the flock all day, but then back into the nest box. She does go out in the morning and late afternoon, about an hour each time, but always goes right back to the nest box. 
She allows other hens into her nest box but keeps the eggs covered and carefully retrieves any eggs that are laid. There are 6 nest boxes in all, but they all go in with her!
I have been thinking of putting day old chicks under her, but I'm not sure how it will work since she is off the nest for hour long periods of time. I've never had broody hens off of the nest for more than 15 minutes at a time. Is the length of time connected to the heat?
Any advice would great!

She allows other hens into her nest box but keeps the eggs covered and carefully retrieves any eggs that are laid. There are 6 nest boxes in all, but they all go in with her!
I have been thinking of putting day old chicks under her, but I'm not sure how it will work since she is off the nest for hour long periods of time. I've never had broody hens off of the nest for more than 15 minutes at a time. Is the length of time connected to the heat?
Any advice would great!
