I don't know what the predicted service life is for one of these, but I got twenty two years out of mine.
Sunday mornings I usually putter around in the reloading room. I tossed about forty pieces of Mosin brass into the tumbler and fired it up and it struck me that I've been using this same piece of equipment since we lived in an apartment in Clairemont, above Mission Beach in San Diego. In a few hours the brass was shiny, so swapped out the cases for some pulled .303 bullets to get rid of the tar sealant the Pakistanis used and clicked the "on" button. It just sat there and hummed.
Goodbye old friend.