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We use the present perfect in questions with how long and answers to these question. We answer with the words for or since.
"For" means a period, for example, for several days, for five years, for two months etc. "Since" means starting from some date, for example, since Monday, since 1999, since school days etc.
— How long have you lived in Toronto? — I've lived in Toronto for three years.
— How long have you known Isabel? — I've known her since 2015.
— How long have you known Mike? — We met in 2013.