I have never really counted them to be honest, at a guess I would say about 40 pairs, some are from Supermarket packs in various prints and colours, others are branded ones mostly in Black or White. I am rather awkward to please though, my pet hate is having synthetic fibre fabrics next to my delicate areas of skin, it plays havoc with my Eczema, and leaves me with a nasty itchy rash, so it has to be pure cotton for me!
I also prefare the Shorts style knickers for everyday use rather than having the elasticated leg trimmings of the more conventional styles, I value comfort over fashion, and it's very rare that anyone else gets to see them except me!