I'm with bigloadz, it depends. If I'm just looking for stimulation, then I can masturbate and back off for 30, 45, 60 minutes, but if I'm looking to cum, then that too depends on the technique. If I'm stroking then it takes a good 6-7 minutes and that vigorous stroking. If I'm dryhumping (laying on bed/floor with bottom of penis on bed/floor and using hand to help with stimulation) then 2-4 minutes.