i have some also and i have no idea when they started laying because YESTERDAY (7/13/13) i couldn't find one of my hens, so i watched the rooster for a little while and he finally went to her well, i went and looked on the other side of a piece of wood and i found her laying on some eggs, ( i think she was adding to the bunch!) i only saw a few but as i picked her up i saw more, and more and more, there were 21 total! so i don't know if they are all hers or if all of the girls lay their eggs in the same spot. i think mine were born the 1st of march so that would put them at about 18 weeks. we also have a couple roosters so we left the eggs and hope for chicks! we have not had any eggs since i found the nest though :-( maybe they are taking a break!