The 10mg pills feel physically heavy duty and hard hitting. I like the heavy buzz, but I've always been careful not to use Nitraz too often. I read somewhere that it's one of the more physically addictive benzos, but that got disputed or questioned when I last posted about that.
With zero tolerance one x 10mg pill should be just about perfect. Any more than that, and you'd be more liable to just fall asleep, imo / ime.
Although of course that also depends on the time of day you take it, and whether you're tired or not, whether you're going to be active or watching TV from the comfort of your sofa, etc etc.