I was botting multiple accounts today, one of which I got from 1-50 mining on; and the other one I am currently sitting on around 45 mining. I have not been banned on either one yet, and I am planning on getting to 60 mining.
Not bad, you just have to make sure you are diversifying your in game skilling throughout your time, not sticking to just doing it like this, maybe switch accounts, worlds, and do some other skills: woodcutting, fishing, smithing etc.