Yeah, two or three days. Wait a week and you'll really have fun.

Marijuana is interesting because the tolerance works differently than most other substances. For instance, with alcohol, as you build tolerance, all you have to do is consume more to get the same desired effects (which can be dangerous). However, with weed, the more you smoke, the less high you end up getting. So, if you smoke twice a day, three days in a row, it doesn't matter how much you smoke on the fourth day, you will still not get as high as you did the first day. Even if you burn through an 1/8th. This is one of the reasons that you can't really say Marijuana is a drug that breeds habitual use, since it's much more fun to string your highs out over longer periods of time. This is also why you are only getting a cheap, short buzz.