Usually 1-2 a day, once more often than twice. If I've got a day off work and the wife isn't around I'll probably go for 3 or 4. It's weird though because every once and a while I'll go through a period of 3-5 days in a row where I don't feel the urge at all... guess I'm getting old.
Peperoni and mushroom, with Hawaiian in a very close second place.
