Lol - no idea really.
Probably a couple of dozen?
Mostly open back,
a few closed back,
a gaming headset,
a few IEM's,
a couple of wireless,
a set of noise cancelling ones.
about a half dozen dac/amps as well.
And now a set of Stax Earspeakers
Will be doing a culling soon - just waiting on a specific amp/system to arrive so I can give them all a decent go and sell off the ones that I can do without.
Ideally I'll end up with 3 or 4 open back, a closed back or 2, couple of IEM's, the wireless ones, the noise cancelling ones and the gaming ones.
Sounds stupid, but each have their own character, music, place and use.