1. How long have you studied in this school?
I have studied for 5 years
2. How long has you dad had....
He has his job for 10 years
3. How long have you had a CD player?
I`ve had it since 12 years
4. How long have you known your friend?
Ihave known him since 3 years old.
5. How long have your parents lived in this town?
They have lived for twenty years