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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.
But chickens do have about 26 hours between eggs, this is the time it takes for one egg to be formed.   And the chicken egg if fertilized can have an incubation period of 21 days at which time a baby chick will hatch out.