I got mine from harbor freight about two weeks ago.
I agree two hours is plenty of time to get the dirt off.
I left my first batch in for twenty four hours and the
coins came out like new but they had a frosted look.
My first belt broke after about forty hours, it was
making a thumping sound like it was out of balance.
I took the cover off and the belt was attached by a
thin piece that was about to break. If you hear that
thumbing sound its probably about to break check it.
You can buy packs of belts on eBay, I went to one of
the harbor freight stores but they didn't have the belts.
http://cgi.ebay.com/5-Chicago-Elect...2302bd7037&_trksid=p3286.c0.m14#ht_500wt_1182
I use aquarium gravel and liquid dish washing liquid.
The motor on mine gets hot also but the manual says it gets hot.
I have a separate shower and bathtub so I never use the tub, this
lets me put the tumbler in the bathtub in case it leaks, but it never has.
I noticed when I changed the belt it was a little tight so I loosened
the four bolts and re-adjusted it so it was looser and this belt has not
broken yet.