Most breeds are fully feathered by two months old and ready to lay at 5 months.
This will vary by breed. A young hen before she reaches one full year is called a pullet.
Hens are usually on the down side of prime egg production by 24 months.
See link provided for chick growth pictures
15 days
It doesn't take very long.
1 month
about an hour
a young chicken develop because of the sperm cell and the egg cell
About 8 months for your average chicken to grow up.
Depending how big the chicken.
one minite
45mins
3.2
About five years.
Patience.
imediately