totally depends on things, like how big the bowl is, howmuch you're putting in, your ability to count (which may be affected by how many bowls you've already smoked) try this. bust up all the weed, the whole eigth. put it all on a sheet of white paper, and seperate it into little bowl-sized piles. now count the piles, and write the number onthe sheet of paper; now this is the tricy part. smoke all the weed, and keep track of how many bowls you have smoked, once its finished get up off the floor and compare the numbers! if they both have the same singing voice then you definitely need more weed.