Yay!!
I have nothing but bantams, and for mine it seems to depend on what breed they are. Most of mine do hatch by day 20, and then some of the bigger ones (bantam EE, silkie/OEG mix hen) take the full 21 days. But most all of my eggs hatch early, and that is when they are in the same incubator as the rest, or sitting under the same hen. It does depend on the temperature, but for mine, the ones that do hatch on day 21 don't seem to do very well.

I have nothing but bantams, and for mine it seems to depend on what breed they are. Most of mine do hatch by day 20, and then some of the bigger ones (bantam EE, silkie/OEG mix hen) take the full 21 days. But most all of my eggs hatch early, and that is when they are in the same incubator as the rest, or sitting under the same hen. It does depend on the temperature, but for mine, the ones that do hatch on day 21 don't seem to do very well.