In general I've found that the smaller breeds like Jap, Sebright, OEGB, hatch earlier. Large Bantams like Faverolles, Brahmas, Cochin, hatch at a regular rate
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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.