How long has it been since~?
~한 지 얼마나 오래 되었나요?
How long have you been married?
How long have you been living here?
I must have moved here 23 years ago.
How long have you been planning this project?
Four months, and I'm so relieved it's finally over.
마무리가 되어서 안도가 된다
How long has it been since you gave up red meat?
It's been about 3 years now.
I haven't been here that long. 여기 온 지 그리 오래 되지는 않았어요
worked in this company/ used this computer
It won't take long.