I had chicks hatch on day 19, then 21. All the eggs were collected as laid. Why would some hatch so early? This sunday was day 21, I still have 6 eggs that have not hatched. How long do you keep the eggs in the bator? Thanks in advance this is my first time incubating! Boy, it is addicting! I am going to try again, but did not want to give up hope on the eggs still in there.