Hi Barb. There was a great article about broody hens by a woman in the UK. She said it took 20 days to hatch under a hen vs. 21 in an incubator. Well, with my batch she was absolutely right! She said to start counting day 1 the day AFTER you put them under her and they will hatch on day 20. My first pips were on day 19 and they were all hatched by the end of day 20.