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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.
Whereas fertilized chicken eggs usually take exactly 21 days to hatch, most duck eggs take 28 days, apart from Muscovy ducks. As a general rule of thumb, the eggs of Muscovy ducks take 35 days, but once again, it can vary slightly depending on conditions.andling fertile chicken eggs during incubation. Once fertilized chicken eggs have been under a brooding hen or in an incubator for a period of about three or four days, you can candle the eggs to see if they've started developing.