Really depends on what your smoking. lol first time I blazed I felt completely blunted for at least 5 hours...its not so much being high as it is getting used to what it feels like to be high. Its hard to predict how it'll be for you but you should be fine with that time frame...lol I think the next step after a few sessions is learning how to play it off in front of parents, teachers and god forbid, cops (lol dont worry, its been 6 years for me and I'm still workin at it hehe)