After only two hours, I would almost be willing to call the .223 brass "done", except that I think they'll get a little better yet, and some of the dirtier pieces are still a little bit stained.
Here are some I pulled out of the tumbler - the two in the front are still-primed pieces that started off the dirtiest:
And a view of the primer pockets:
So now they're all back in the tumbler with fresh solution for two more hours.