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The most important factor is the bevel. If it is set correctly, then you are 90% there. Also depends on the quality of the steel, the honing ability, and stropping. If you only use it 2-3 times a...

That's a question with no answer. Depending on the bevel and condition of the edge, it could last forever. I have picked up Genco's over 100 years old that with some minor honing on a 8k or 12 k...