I've only owned my 2 Buff Orps for a week and a half. I was told when I got them,that all the hens were layers. There were hens that ranged from 7 months to 1 1/2 yrs old, and judging by their combs,seem to be 1 1/2. Now,i'm not in a hurry for eggs right now, they have been treated and can't eat the eggs anyways.I'd hope by spring they would be settled and start up again. I'm still curious though,based on experiences,how long after introducing new hens,do they lay? They aren't molting,and one has a really red comb.