My EE began laying toward the end of January, at 19 1/2 weeks. Her comb wasn't very red (and still isn't), she had been checking out the nest box a tiny bit, but not nearly as much as a few of the other girls, and she wasn't much of a quatter. Now, on THAT day, I only had to walk by her on the way to the coop and she squatted big time...and sure enough she'd layed a tiny green egg. So I think they're all different...