I have always lockddown my bantams at 18 days and they start hatching the next day. I just had 34 hatch the last one hatched late last night at 21 days, 5 hatched at 19 days and 28 hatched at 20 days. Throughout the early AM on into the late PM of course. I was so happy 100% hatch, after I tossed 8 at day 10 that were clear. I removed the 33 chicks yesterday as they needed room, and left the lone egg in the bator with no pip.