I don't know how long I'm stoned for, it really depends on the quality of weed and how much I smoke (you talking three large bowls, or three small ones?) I got a pipe that hold a dime in it's bowl, so if I fill that up one bowl will fuck my brains.

I guess I'm STONED for an hour - hour n' a half, then I'm stoned for another hour or so after... then I'm just burnt out and ready for the next round. Lol.