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About five years.
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
That is not possible. It may take up to six months to develop the immunity. Falciparum malaria will kill you very shortly. You have to take treatment for malaria.
Eight thousands years
An penguin is a bird that can take a very long time to develop from an egg to an adult.