Originally Posted by vegandude
I sharpen every other day whether they need it or not as you do not know what you'll run into the next day. I carry one extra blade for each mower also. I use a belt sander with 120 grit, it hardly removes any metal unless necessary and leaves them razor sharp.
I assume you noticed that new blades don't come "razor sharp". Not even fancy aftermarket blades. If you just blunt about 1/64" across the edge (as they typically come) they will stay "sharp" much longer. That "razors edge" typically lasts about 2 minutes before it begins to get ragged.
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