The eggs start to hatch about 60 days after they are laid.
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It takes about 21 days (3 weeks) for a chicken egg to hatch. 21 days exactly when they started incubating.
With optimum conditions such as temperature and humidity a chicken egg takes 21 days to hatch. From when it was layed, about 20-28 days,depending on the breed. From the time when the egg first cracked, about one day. This is a very slow process.
Chicken eggs require 21 days at 101F to hatch. When trying to hatch chicken eggs, give them a few extra days before throwing out eggs that have not hatched as they may have been cold and needed a day or so to come up to incubation temperature.
Around 3 weeks my bantam chicken is about due to have her eggs hatch and we have let her lay on her eggs for 3 weeks!
21 days is the incubation time for all chicken breeds.