I tumble my rifle brass for a day or more to get it good and clean, it's much easier to see splits on brass that really shines. I'm also a fan of dryer sheets in the tumbler mix to absorb dirt, it helps the media last longer. All I use anymore is the crushed walnut, a 50 pound bag will last me several years, the corncob polishes better, but so does leaving it in the tumbler for 24 hours with a little polish!
Once the brass is clean, I lube and resize it, then toss it back in the tumbler for 30-60 minutes.
And yes, a little lube on the Lee Turret press goes a long way to make it last. Mine is due to hit the 700,000 round mark right after the holidays. I also tear it down and give it a thorough cleaning about every 15,000-20,000 rounds.