If your not doing staggered hatches, It is best to collect the eggs and add them all at once. 5 to 10 days for fresh eggs. 5 day of collecting is best.
Let me find a guide I have.....I attached it to this post.
The shipping method is one of the best ways to ship eggs too
Staggered hatches work better if you have a week between them and use a second incubator as a hatcher. Humidity, temps and even hatching goo that gets on the eggs seems to mess up the later hatches if you hatch them together.
For the hatcher, you can use a low cost incubator from a feed store...
I know! Some eggs are like torpedoes!
I had that happen once that I know of. I did not catch quickly because I do not candle all the time anymore.
The chick broke out of the shell like the hulk though. I did not have to assist
Doing great!
Did you candle the eggs to make sure you had the air cell up during incubation? Tilted down will make the hatch out of the small end--where the air cell is