This is a scary question in some ways. I answered 300-400. The reason in part is that was always a gear head, provided I could pay for it. I'm still a very active shooter at 70, but I've been a collector of things, not always valuable, and I've always used multiple lenses simultaneously.
I probably own 100 of the relatively simple Kodak and other folding cameras, all have difference lenses and shutters. I own a variety of bellows, self-contained etc. cameras on the higher end of 100 years of so back. My earliest large camera is 1903 and I have some that go back to 1880. I like wooden cameras. I have brass lenses that go back to the 1850s. It's embarrassing.
I collect old plate cameras (I try to use all of the cameras at least once, sometimes more) in sizes from 4.5x6 to 6x9 to 9x12, Recomar, Bergheil, Maximar, etc. IN all about 25, each with different lenses and shutters. At least 35 view and press camera lenses in shutter.
Two View Cameras (in use, sort of) with probably a dozen lenses. Kodak Retinas, all the lenses available depending on body ID, plus I own the reflex version.
In digital, my primary worker are Canons, crop or not, but I have lenses from 8 mm (2, one russian, one not) reach out as far as 500, including three 70-300s, 55x210, My favorite digital in some instance is an MP-9p which allows me to use all the vitange and modern lenses abailable. Soviet screw mounts, various bayonet mounts, there are probably at least a dozen different versions of the Summicron in screw and bayonet.
I worked as a pro for 10 years in there 60s and after giving up Leica RF over cost and beating, was fully kitted in Nikon RF and then in Nikon F. I used 4x5 Graphics, i.e. speeds, crowns and graflex, with assorted lenses in focal lengths multiple brands. , e.g. 90, 127 135, 200, baby berthas and big berthas (near the end of the era).
It's time I did an inventory, but first I have to get back in my cameras.