I bot about 14-18 hours a day on my main. Sometimes a little more or less though. I try to bot the entire time i'm awake, then turn it off when I sleep to at least make it seem legit. I've gotten 4 99s on my main, and a 99 on my pure without being rolled back or banned. I've even been reported by a mod, and still nothing.
I'm assuming i'm just very lucky though, I wouldn't reccomend botting that much.