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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.
Confidence votes 105. It takes about 21 days (3 weeks) for a chicken egg to hatch. 21 days exactly when they started incubating.