How often to replace media in a brass cleaning tumbler

I think it was five or six years ago that I bought a "Thumler

Buying Guides Tumbling FAQ Tumbling Rifle Brass with Stainless

Results from the Great Brass Cleaning Experiment : r/reloading

Brass Cleaning with Stainless Media within

DIY: Wet Media Tumbler (Pic Heavy)

Gear Review: Frankford Arsenal Platinum Series Rotary Brass

Tumbling Media for Brass - Inovatec Machinery

Play With Your Food: Clean Brass With Rice :: Primal Rights, Inc

Lyman Easy Pour Turbo Brass Cleaning Media

Cleaning-up options for brass —and maybe some gun parts