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1 You must not turn the eggs once they have been in the incubator for more than 16 days. 2  Donât open the incubator if you donât have anything important to place inside. 3  The chick obtained beyond 22 days are usually unhealthy.
When the egg is about to hatch, the need for getting fresh oxygen increases. The incubation period for a chicken egg should not be more than 22 days â usually the chicken egg hatching process ends in 21 days. You should turn the eggs three times a day â once in the morning, then afternoon and then at night before going to bed. If you wonât do that, the embryo tends to get stuck inside the shell.