I only buy pipes that are bigger than my pecker, that is why my collection consists of all nose warmers.
I used to buy pretty big pipes back when I was smoking a lot of English blends and ribbon cuts. Now that I only smoke flakes, my biggest are group 5 which lasts me a good 1.5 to 2 hours. Plenty of guys like Bradley want a clubbed weapon hanging from their gaping maws, they use them for any anti smokers who may open their mouths.