Very moderate, a bowl a day, with binges of two or three from time to time. Because I have many pipes, by my account about 94, I always use a different pipe and keep them all in rotation to the degree possible. Many old time smokers, like my dad, smoked only one pipe until it burned out, all day from breakfast to bedtime, always Granger from a pouch. Pipes will take a lot of abuse, but having at least a few pipes, and rotating them and resting between days of smoking is a good idea. But you can smoke a pipe a lot without doing it any harm. Incidentally, I would guess my dad's pipes usually lasted about a year and a half or two, though as a child my sense of time was elongated, as is true for most children. A year took forever.