I have a lot, like Laura and Lucy. I stocked up on bras and underwear this spring when the pandemic hit, because I read about supply chains drying up for basics. Sure enough, my two favorite bras (one wireless style and one underwire) are both discontinued. My size is not easy to find and I’m not an easy fit (small ribcage and large cup size) so when I find something that works, I duplicate like crazy. Consequently, my bras last a long time — 2-3 years is not unusual at all — because I rotate. Plus I have different colors so I can wear light under light tops, even though I much prefer black and dark colors. My size is rarely available in fun colors so with the exception of two, and my sports bras, they’re mostly black or nude.
So I have about 6 underwire everyday bras, two wireless (and could use more because that’s what I’m wearing most now), and two bralette-ish styles (and could use one more of those too). I also have 6 sports bras because that generally gets me through a week of workouts when I’m exercising regularly like I should. I wash those after every wear and do laundry once a week.
I also have a small assortment of special occasion/lingerie type bras but rarely have use for them (strapless etc).