<p>I think nobody responds to the AP Econ threads because it’s a less popular AP than other ones. I’m taking it this year too so I don’t know much about it; my school only started offering it this year. Nobody replied to my thread about it either…
I do know 5 Steps To A 5, Barron’s, and Princeton Review are all good review books, but I’m not sure about a textbook. Once my class starts (September 2nd) I can tell you what book my class is using if you want. 
As for studying, I’d go with an hour a day or a few hours a week. If you already have a full schedule at school along with it, any more than that might be stressful. I’ve heard Econ is a class that isn’t too difficult to self-study, but good luck. :)</p>