How long does it take to hatch chicken eggs?
Chicken eggs take exactly 21 days from the date they are started
incubating. Hatched naturally, most broody hens will take about 6
days to gather enough eggs and then set the nest. For the next 21
days she will seldom leave the nest except for defecating and
occasionally for food and water. She will not allow the eggs to
drop more than a degree or two in temperature.
Artificial incubation of eggs starts from the day you gather
enough eggs. Eggs can be gathered for up to 7 days if the first of
the eggs are maintained in cool humid conditions. Once enough have
been collected they are set into the incubator and again, 21 days
later they should start to peep (hatch).