2
How long has your grandpa been on holiday?
For a week.
3
How long have you and your family lived in this town?
Since I was five or six.
4
How long have you known your best friend?
For about ten years, I think.
5
How long has your sister wanted to be a scientist?
Since her first year at school.
6
How long has your teacher worked at your school?
Since September.