if i put my mind to it i can make 2 grams last about 2-3 days of being stoned, but im not talking about savin little roaches, cappin' bowls and scrapin out the res after its all gone. but i like to smoke my pot comfortably with many friends so i dont pay attention to all the little stuff.
ps. smokin out of aluminum pop cans is seriously bad for you and it tastes like ur suckin on a mouthfull of paperclips, invest in a nice peice of glass