While not obvious, I do think there is a UX angle to this question;
If bots can read a Captcha better than a human user, why include them at all?
After all, it more often then not, is damaging to the user experience. 28.4 seconds is a long time for a user to be stuck at such a hurdle, and we've all been there - to say it's annoying would be an understatement.
So if a Captcha isn't able to do the job it set out to do (by that I mean preventing bots from submitting data), then it serves no purpose and thus should be removed.
Of course, I recognize that there is a need for Captcha's as not all bots are able to read them, and without a Captcha spam may just build up all too rapidly.
My preference would be to refrain from including a Captcha, and instead moderate submissions via filters etc. Perhaps with final approval coming from a webmaster.