I guess my cadence depends on what I am smoking and when I'm smoking it. I've tried to quantify this before, and I would say that my comfort level is somewhere between 3 "sips per min" and 5 "sips per min". However there are still times, especially when I'm really enjoying something and not focusing, and/or had a few drinks, where I'll hit something like 8-10 sips per minute, which imho is way to fast (I'm just asking for tounge bite at that pace especially with less forgiving blends) and if I'm really going, I'll hit something like 15-20 sips per second (and regret it later). As far as the mechanics of my sips, I guess that also depends. I try and listen to what the smoke and my pipe is telling me. Sometimes if I'm borderline hot I'll take tiny little puffs and slow down, and other times I will take much longer, satisfying draws. It all varies so much throughout a smoke and from smoke to smoke, that it is hard to give someone a good baseline. But the best thing I could say is just listen to what the pipe is telling you. I just always try to keep my pipe feeling a little warmer than my hand.