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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.
Iâm not sure if you are talking about âif none hatchâ or âafter some have hatchedâ. In theory chicken eggs should hatch after 21 days of incubation but thatâs just theory. Many things affect when eggs hatch, heredity, humidity, how and how long the eggs were stored, and just plain differences in individual eggs.A big factor is average incubation temperature.ine are never late but others have reported eggs in an incubator and under a broody a few days late. That 21 days is just a theory. Reality is often different. Iâve had hatches that were totally over in less than 18 hours from the first to the last.