ours stay in till noonish ...most have laid by then..My husband and I recently expanded our flock to 10 Australorps, and you know what that means... Quarantine!
After seven days of The Big Q, we let the flock mix in the open pasture out back. Only problem was, losing access to the coop (the six babies were locked in there for seven days to teach them where "home" is), our laying mamas got out of the habit of laying in the nest box.
So we have them ALL locked in the coop now to retrain the mamas to lay in the nest boxes. A few days should do it.
Thought I'd share. ^_^
MrsB