I put in the nest boxes the day before the first girl laid, at 16 1/2 weeks.
Yeah I'm a procrastinator.
She was scratching around on the coop floor, her comb was red and she was squatting when I put my hand over her.
She was gonna lay on floor of coop the next day. I picked her up and put her in the nest. 35 minutes later she came out and I found a beautiful brown egg.
View attachment 1362791. The white egg is ceramic.
I would open/install the nest boxes at 15 weeks with fake eggs, so they can climb in and investigate the nests. GC