lol, well you're going to need a lot of zeal, and i'm assuming that you're doing it legit? then i would say around 2 months if you play 6-8 hours a day
So just alone, 60-99 str is roughly 1800 zeals. Assuming that you will be training str while attacking players should be able to get you down to 1.5k-1.6k zeals by the time your done. The amount of gained in game XP you receive will lower the amount of zeals you need. So if the bot runs 24/7 it should roughly be around 100 per 24 hours so expect 15-16 days or so.