Zero, I never ever solve one. Do I look like some ant that works for free to train your shit google?
Persistence in giving wrong answers is key. And if it won't help, a boycott of the site/service and a mail to the admin. Noone cares, I know. Even the AI-hater obediently solve recaptchas.
Oh wait...I actually DO overthink it, it seems. Even beyond the borders of the task itself 😁