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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.he incubation period may be up to 21 days â so what you need to do is maintain the humidity percentage about 55 to 55(83 o â 87 o F (28 â 31 C). This should be done for first eighteen days, and for the last 3 days it can be near to 65 percent (89 o â 90 o F (31 â 32 C).