How Long Does It Take To Get Over An Ex? When I was in high school my bff's older sister told us that however long you dated for, divide by 2 and that was how long it took to be completely over the guy. That has never been accurate for me. :no: Sometimes I bounce back quickly, but there was one time it took me over a year. :frown1::redface: We had dated for 12 years if that means anything to those of you determined to come up with a formula.