For humans, it takes 9 months plus or minus 2 weeks.
That's to birth, It takes at least 16 more years to achieve physical (or sexual) maturity,
and 26 for mental maturity.
The fetuses develop in the womb of the mother.
1 month
About five years.
Patience.
imediately
No, they have baleen. Tooth buds do develop in fetuses, but these aren't retained.
A person does not 'develop' autism - a person is born autistic.
From the time your breasts begin to develop, it should take two to three years to completely develop, however some girls do develop slower or faster than that.
It's May be take 2 days
1/2 years
Eight thousands years
62 days