Lots of variables w/ me...when I work a 12hr shift, then vap some bud...usually the second time around does it...after that I just turn irresponsible & pursue Nirana w/ reckless abandon. A good vap buzz 2-3 hrs...if I eat good quality edibles, it can last up to eight hours...I use alot though.:stoned: Longest buzz came from some firecrackers I made...must have ate twice what I needed...I lost most of the day...I used really good bud.