If your just looking for something economical try a midway 1292 model .I have two of them and never a problem .Some people like corn cob and some like walnutshell media ,myself I buy a 25 lb bag of ground corncob from the pet store that they use in bird cages.I used to clean 5 or 6 thousand rounds aweek as part of my business . just about any good brass polish will work . The amount of time depends on how dirty the brass was when you start ,but around a hour or better . Hope this help some.