Chicken Eggs: It will take 21 days to hatch a chicken egg in an incubator. Quail Eggs: It will take 18 days to hatch a quail egg in an incubator. Duck Eggs: It will take 28 days to hatch a duck egg in an incubator. Goose Eggs: It will take 35 days to hatch a goose egg in an incubator. Some chicks may hatch early or late than the rest, so I usually keep the eggs in the incubator for up to 5 days after the last hatch - just in case!