Ill be honest. I dont measure. My methods are unconventional.
In the summer i take my deprimed brass. Throw it in a bucket with a bunch of hot water and some tide. I put the top on and bungee cord it on to my lawn tractor when i cut the grass (2 hours usually). Then i dump the water, rinse and put some lemishine and hot water in, shake it around let it sit while i drink a beer or 2. Rinse, dry and tumble in walnut with some brass cleaner polish goop in it. In the winter i dont mow so same process but without the mower ride. Dont know if the vibration helps, but i feel like im multitasking and reusing shaking viration that would normally be wasted, lol. I really dont see much difference winter and summer brass. I know it sounds like some redneck stuff , but hey i got my methods and you got yours.