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how long does it take for a chicken egg to hatch that is not in the incubator?

how long does it take for an chicken egg to hatch that is not in a incubator? when the hen and the rooster sits on the eggs at night 12 hours does that count as days or does it need 24 hours im just wondering cuase i have some eggs of my own i have 5 eggs they say it takes 21 days in the incubator and the incubator is on all day and all night so i was wondering does the chicken have to sit on them 24 hours to be 1 day or 12 hours to be 1 day count? thank you for answering my ?

Public Comments

1. The rooster does not sit on the eggs. He needs to be taken out before the eggs hatch, he can kill the chicks. Chicken eggs take 21 days to hatch, it doesnt matter if its under the hen or in a incubator. A hen will sit on her eggs most of the day, only getting up to eat and drink.
2. 19 days for miniature fowl and 21 days for large breeds. If the hen is off the nest during the day she will not be broody yet and will probably lay more eggs before sitting them. i hope this helps.
3. the rooster can still be in the pen with the hens when the chicks hatch he will help feed them it takes 21 days for them to hatch the hen will probably get of her eggs during the 2nd week for about 20 minuets a day to dust bath and get food and drink bantam eggs usually hatch on the 19 or 20th day so it takes 21days doesnt matter how many hours she sits on them
4. exactly 21 days for 24 hours a day, chickens that are laying only get off them when they get feed or water, then they go back to the nest...