Several bowls a day depending.
I'm not a clencher so I need both hands to smoke.
When I'm asked to do a days work or am busy I smoke less.
Lazy days behind my laptop I smoke more.
Before I found pipe smokers forums I really didn't have much of a clue and smoked the same pipe day in day out for several years.
A Peterson Sherlock Holmes which has a huge bowl.
Because tobacco is real expensive here [now around $125 for 50g] I was in the habit of 'topping up' my bowl until the baccy on the bottom, which acted like a filter, needed clearing out.
Remarkably, the Peterson stood up to the abuse and never turned sour.
Once I found computers, the internet and the pipe smoking community, puffing on a pipe became much more enjoyable.
Now I've got over forty pipes in my rotation. All good smokers [got no time for temperamental pipes]
Were I to start from scratch building a rotation today, I'd buy myself several MM cobs with the hardwood bit at the bottom of the bowl and maybe a few briars.
The fact is that an MM cob smokes just as good as an expensive briar. Price and name is no guarantee.