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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.
The length of the incubation period for chicken eggs is 20â22 days; duck eggs, 27â28 days; turkey eggs, 26â28 days; and goose eggs, 29â30 days. The main physical factors in the conditions of incubation are temperature, relative humidity, and chemical composition and rate of circulation of the air in the incubator.