Mine were around 22 weeks before they started laying. One of them just started a week ago-at 26 weeks - she's the one that had been squatting for a full month. She sings the oddest egg song too.. more like a screaming squawk that sounds totally offkey. You'll probably notice most of your birds will lay for 2 or 3 days, then skip a day or four, then start up again. I've got one who has laid 8 out of 9 days since day one, but the rest have been erratic and I expect they will be for some time yet. So don't be surprised if you get several eggs a day followed by none or just a couple eggs. Personally, I suspect a Chicken Conspiracy!