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Put the eggs in the tuner, fat side up, until day 18. On day 18 move the eggs to the carton, with bottoms cut out, fat side up. Chickens usually hatch on day 21, but if you temps were low, then give a few extra days.
You store eggs to hatch for about 7-10 days. Keep them around 50 degress and turn 3 times per day until you put them into the incubator.
I do hatch in a carton also. I will never hatch again with the eggs on the incubator floor. I have found that the chicks have an easier and faster time getting out of the shell. Plus it makes clean-up so much easier.
Good Luck