Tumbler Question

I am using my tumbler overnight nearly every night to clean and polish. How long can I expect the tumbler to last like this?

I am tumbling for 1 hour with a rice and Brasso/corncob/walnut mix to clean out all the range dirt before decapping. After decapping, trim for length and clean primer pockets then into clean walnut and brasso for the night. New brass in the morning.

Seems to be working so far.

Now to find some 50BMG loads with something other than H50.