I have no fucking idea why the captcha refresh is so fucking low. I've always been one to solve the captcha and then edit my post or something just solve it and then continue writing something, by the time I'm ready to post it's expired and I have to do another one.
I don't even see why they need to expire, let alone do so in like 30 seconds. At least google would have a good excuse, they get more training for their image recognition. What's 4chan excuse? The captcha is worthless data, it doesn't provide a benefit or service, it exists just to make posting more difficult with nothing else to it. On top of that, It only cost more resources to serve you up another captcha.
So quite literally the only benefit to this at all is if they take pleasure in fucking over users and making their lives just a tiny bit more miserbale

Which we all know they do