Really? I was thinking 21-23 days, having read that somewhere. Totally unprepared! got them brooding in the bathtub in a spare bathroom, and got temperatures relatively settled in quickly. Feed store opens in a few minutes, headed straight over there. 2 healthy, 2 didnt make it once they got out, and 1 died coming out of the egg, seems to have snapped his own neck against the shell. 95 eggs left!