Couple of questions.

Where is the best place to casually farm renown? I'm looking for a nice out of the way place where most players generally avoid as it's a hassle when getting interrupted. Also, is there a particular creep class I should roll for renown farming? I don't mind paying a little to unlock more classes if one of those classes offers more renown than the others. Finally, assuming i can farm steadily for 8 hours a day, when do you think i'll be able to reach R15?