So we have our girls in a pretty big tractor. Well we put the dogs up and sit outside and let the girls run around in the yard. They always go in after about two hours. IT does not matter the time of day or anything. (We used to think it was because we did it around 4 and they go to bed about 6, but we let them out at 1pm yest and by 3 they went back in the coop.) Now the br chick (2 months old) would stay out all day following me around like a little puppy. She is the cutest thing.