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Actually, the egg cartons can be used for the entire incubation and hatch. Not every incubator has a turner and if you don't have a turner, an egg carton can make it much easier to turn the eggs. I incubated mine in a carton, and then rather than open the incubator multiple times a day to turn the eggs, I just tilted the whole incubator on one end (thick book under one end) and when I needed to turn, I just moved the book to the opposite end.
Some people also hatch in cartons and some don't - personal choice. I chose to hatch in the cartons but next time I plan to take them out. I know a lot of people say that in three years of doing this they've only had one chick pip the wrong end yada yada, but in my case, out of 11 eggs in lockdown TWO pipped the wrong end. And unfortunately, I lost both as I wasn't able to help them in time due to other chicks hatching. It was enough to make me rethink the "hatching in cartons" thing, even though most people who do it don't have that experience.