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if edge doesn't have any chips etc you should set bevel and move on. Now in that video razor was from bay and i thought it will have bad edge at first after couple passes on dmt i checked the edge...

Number of the strokes is depend on a lot factors blade material,grind,stones condition,etc.
the best you can make sure to move from 4k to 8k is make sure when you cut your arm hair ,You will see...