I run my iDung for about 8 hours a day, then do the rest legit. It's pretty nice, haven't had any problems. It takes me about a week to get a chaotic from 1-80, faster the higher dung / stats.
1-80 you probably take 2-3 weeks depending on how much time you use it per day, and your stats, it is highly recommended and really safe personally I've used it for 78h straight with out any problem