I have no idea, frankly. I have 20-odd chickens (and, also, 20 very odd chickens, lol) and they lay when they darn well feel like it. Me, I gather eggs sometime between 4 pm and 5 pm most days. Occasionally if there is a hen on a nest that late I will have DH check that nest when he locks them up at dusk, and sometimes he will find a late-laid egg. Our hens free-range most of the day and return to the coop to make their deposits, then go back out to forage some more. They're very dependable.
