I have four Golden Comets who started laying in the past week. Also have two Buff Orphingtons and two Barred Rocks who are several weeks younger and not laying yet. My feeder still has about 25 pounds of chick starter in it and my guess is it will last at least three weeks. I give them scratch, grass, and other treats and they pick up lots of other goodies in the run so the feed has really lasted a long time. Should I switch to the layer crumbles and remove the chick starter or let them finish the chick starter? I did place a dish of oyster shell in the coop for who ever wants it. All of them seem to eat some oyster shell . The comets are 21 weeks and the buffs and rocks are about 18 weeks.