my highs ussually only last 30-45 min, but then again I've been smoking weed almost everyday for 5 years now lol one of these days I'm takin a 3 month break, and then I'm sure my tolerance will be low as fuck again and plus last time I quit smoking when I was in grade 11 after 3 months my mind cleared up amazingly, it was like thinking crystal clear for once lol I want that feeling back one day even iof just for a bit lol

Edit: Oh and one more thing if ya want your high to last longer, DO NOT have munchies, it kills your head buzz! <---- I'm sure someone will say to that: "munchies don't kill your high!!" well they do for me, and I know a few other people who feel the same way!

Edit: another tip: have a drag of a cigeratte after you smoke, it increases your high!