I didn't count, but I've spend too much time solving reCAPTCHAS. Google should be paying us for that. I'd guess an AI creates the tasks and x humans verify it -> the AI learns. Whatever their profitmodel is besides tracking, we should get money for that. For giving our data (another topic) and for every hour of solving those damn captchas https://www.youtube.com/watch?v=7B4bEXLJIl8
I use <a href="https://github.com/dessant/buster" rel="nofollow">https://github.com/dessant/buster</a> if I need to.
Basically zero. Most sites I use I have accounts on, so I don't get captchas there. And those I don't... well my Gmail account basically means I skip the captcha altogether (at the cost of being tracked by Google).