It IS possible but you will most likely get banned before you can reach even 70. Jagex made randoms for the first bots - Autominers. They've known how to pick out people who auto mine for years.
i botted on one account from 1-80 mining on a shitty rsbot.net bot and the account didn't get banned. Several times i botted 14+ hours.
OT: I think if you suicide botted you probably could do it but it really wouldn't be worth it because you'd prolly get banned. Just do 6-10 hours a day powermining and you'll get it in a few months without getting the banhammer