Depends on the size of the bowl as well, but how slow or fast you smoke will depend on you, the pipe, the tobacco and the pack. If it keeps going out, you are either smoking too slow or not packing it properly. Or maybe the tobacco needs drying. Experiment with your packing to see how it affects the burn. If you are smoking it too fast, the bowl will get real hot (some like clay get hot anyway), the flavor will suffer, you may generate a gurgle, and of course, you will burn through it in a short time. As many have said, try to relax and enjoy it with slow, steady sips, this is a relaxing pastime for pleasure, not a race. Like many things, it is a bit of an acquired skill learned over time, which is also part of what makes it worthwhile.