Hi sped, welcome to TFF and the reloading forum.
I'm no expert on tumblers, just recently got a Frankford Arsenal tumbler myself.
I just add media and tumble until they look shiney enough for my taste and let it go at that. Usually a couple or three hours is all it takes.
I have a little invention I've used for the last 15 years its an old zerox machine electric motor that turns pretty fast RPMS, no way of clocking it, and put it in a little metal sheet frame I made. On the spinning shaft I mounted a small 1/4 inch chuck that holds different caliber mandrels to spin my cartridge brass while holding some 3M crokus pads to spin them bright and shiney in seconds.
But this is a bit labor intensive but does a better job as it far out does the media tumbler as to the end result.