Wet case tumbler in action

Once loaded with stainless pins, your used brass and burnishing compound all in warm to medium hot water the rotating tanks are left to run for anything from one to two hours.
The length of run is dependant on how full the tanks are. For example, if you fill 1000 or so 9mm cases I would normally run the tank for 1 1/2 to 2 hours. With say 500 cases one to 1 1/2 hours is plenty.