I like my brass to look as good or better than factory. Completely unnecessary, but thats what I like to do. 4 hrs in walnut with some Nushine and used dryer sheets typically gets me there. The used dryer sheet trick that I picked up here has been a godsend, keeps the dust to a minimum, and I usually add a little nothing to my media just before tumbling, that also keeps the dust down
Recently I had some brass that until this year I would never have picked up from the range. Not damaged, but very dull, had been on the ground at an outdoor range for at least a few days in the Florida elements. 8 hrs tumbling and they were shiny, wouldn't call them bright, looked similar to lacquered steel cases when I was done. Those all shot just fine