I repeat quite a lot a work because I am lazy. I am trying to do less of this because there is no need. But 5 bottoms and 10 tops would be ample especially if you can mix and match. If everything coordinates capsule style you might get by with even less, maybe two bottoms a dress and four tops, with a cardi or two and a blazer. But you'd need quite a few scarves and different tights to be able to make it work. (Eg, black, grey and navy tights would give the outfiits different feels).