met him
私は彼と知り合って長い。
I've known him for a long time.
彼と知り合ってもう長いのですか。
Have you known him for a long time?
彼と知り合ってどのくらいになりますか。
How long have you known him?
彼と知り合って一年ほどになる。
It's been about a year since I met him.
彼と知り合ってから二年になります。
It's been two years since I met him.