Edge-Life & Re-Sharpen Estimator

Estimate how often a grade needs re-sharpening and its relative annual sharpening cost. Ranges reflect trade/vendor consensus for typical professional use — not a lab edge-retention cycle.

Relative annual sharpening cost index: (China 440C at 60 cuts/week = 100)
A quality Japanese-steel pair takes ~20–30 re-sharpenings over 7–8 years. Confirm sharpening pricing with a convex-trained service.
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