Probably about 20?
I have about 12 pairs of Piper Knit breeches that are my everyday breeches. That allows me to wear a pair each day for six days, then I do a load and air dry them while I’m starting in on the other set of six. When I was riding one horse I’d typically wear them two days, but now I’m riding two, I usually wash after each wear. SmartPak was doing deals like on sale, plus buy 2, get one free, so most of these cost between $20 and $50.
Also have 2 more pairs of the knits for show/clincs, another pair of white breeches, a few pairs of tights, pair of winter breeches, and just got a cute pair of PS Sweden breeches that I’ll probably save for lessons and clinics. I still want to get a pair in denim, but I’m trying not to go down the rabbit hole of different breeches. I like having many of the same fit and seat type.