They're not that dull. Here, I made a little video. I'm not cutting anything difficult but it's all I have for now. I can't embed it, but here's a link.
That's not even vaguely a rule of thumb.
Also make sure you have the blade clean from the previous stone, and that you do not accidentally transfer grit from a coarser stone onto the 6000 grit
If your knives are just dull and not damaged (no chips in the edge) you really only need a 1000 grit and a 5000 grit to get a decent edge. I'd get a
Damn, really? I liked Bloomfield alot actually. Brock does some nice things, but my least favorite episodes were usually the ones where he travels.