It's an odd hatch! I set the eggs 19 days ago and three have already pipped, but I just locked down yesterday. Silly little chickens. I have about 7 australorps and 13 "Austrashorns" (our nickname for a barnyard cross of australorp rooster and shaver/leghorn hens). One pipped half an hour after my final candle before lockdown! I should have locked down earlier. My only guess is that they incubated on the counter for a day before I set them because the temp/humidity has been perfect, although I missed a few rotations. Next hatch will be all bantams, I'm excited to see the colors I get from my itty bitty teeny tiny mille fleur bantam roos with my dutchie hens!!! I'll hatch a few mille fleur eggs too. They're unbelievably tiny!!!