I'll usually have a couple girls in the nest boxes when I open the coop at 6:30a and everybody is pretty much done by 4:30-5p. I have 29 RIRs born in April and when they first started laying I never knew when to expect an egg. But as they gotten older they seem to be settling into a more regular cycle. Also, I have 8 nest boxes for the 29 girls. They'll lay in all of them, but I think some of them wait for their "favorite" box to open up