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It really depends on how far you take your initial polishing. I took mine to 2K W/D, then a very hard J-Nat tomo and then a six inch piece of tool steel on oil with quite a bit of pressure.
Four...

+1 to the description above.
The last one I did, a primitive Black form Dan's that's about 8"X4" took me about three hours to get it just right, and that's after a week lapping it flat and polishing...

I use a six inch long piece of tool steel, one inch wide and half an inch thick. Allows me to use a great deal of pressure with allot of control.
For me this seems easier on the hands, can be used...