There is no definite answer to this question. If everyone knew why we got banned, we wouldn't be getting banned anymore. Some people run 30 bots a day, 24 hours a day and never get banned. Some people run the bot for an hour and get banned. This is rule number 1 of botting: Don't bot something you're afraid of losing. If you are afraid of losing your account, don't bot. It's as simple as that.