The cleaning time will depend on the level of brass dirtiness. I run my Frankford wet tumbler for 3 hours with range pickup brass that has been sitting in mud/rain/dirt etc.
For my revolver brass in moon clips that never hits the ground ... 15 minutes would suffice.
BTW, just noticed that the Frankford Arsenal Platinum Series Rotary Case Tumbler is on sale for $139 @ Midway which is a great deal with free shipping. LINK