With my $50 dollar Roor imitation bong, that doesn't have any special glass on glass, just the cheap standard $5 bowl I always break, but anways, taking one rip of my kb Im stoned, and taking 2 hits, Im fucked. So no more than two..My bong works very well . With a reg pipe or my volcano, it takes between 5-10, so the efficiency of my bong is very well for getting me that right buzz :thumbsup