With a nice big coop that is well ventilated, I would probably leave them in for at least 2 or 3 days and nights, before letting them out.
I have had chicken coops with lights and ones without. There needs to be enough light for the chickens to see in the daytime, so they can eat and drink and...
How big is the coop? Does it have good ventilation?
It is often a good idea to keep them shut into just the coop for a few days, so they get used to being in there and form the habit of sleeping there. But some coops are too small, and some coops get too hot, so there are times when that is...