3 days in sims time(that means 72 minutes in real time)
Chat with our AI personalities
a month ur sim takes a month
6 months
Not very long about 2 days if you play it a lot
If you are talking about The Sims 2, below the picture of the your Sim there will be a little bar, on the bar there will be how many days it will take until that Sim grows up.
I hear from a lot of people around about 2-3 days. It should take very long :)