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+1 it varies.

In a recently translated Japanese study shared with this forum
the author made the point that a correct angle will serve the
user for +100 shaves while the wrong angle might top...

Give the WiKi a search for the pyramid method.
It uses a Norton 4K/8K combo and with a gentle
hand the method with give a fine shave.

The Norton can be followed by a 10K or 12K
water stone if...