How long has she lived there?
For three years.
For + как долго = 5 days, 10 years, etc.
Since + с каких пор = last Monday, 2015, etc.
How long has she lived there?
For three years.
For + как долго = 5 days, 10 years, etc.
Since + с каких пор = last Monday, 2015, etc.