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The time it takes depends on many things - for example how coarse the coarse stone is. You could conceivably spend several hours on some razors if your coarse stone is only 4K, for example. And of...

Honestly, I don't know anything about the new Friodurs. My "old" one is a great shaver and always take an excellent edge (in fact it has only taken 3 edges over the years since it is quite durable)....