This depends on which manufacturer made the blade. Scag blades for example are razor sharp and hold their edge very well.I'm with rhmarw. I also use the bench grinder for better control and angle retention.
In case you are new to blade sharpening, the original angles -both A and B below- should be followed and retained.
Sharpening down to a fine edge is a mistake. That allows quick wear and rounding of the fine edge as it is too thin to resist wear.
Take off only enough material to bring the leading edge (B) down to a little under 1/32nd of an inch. I then file that front of the 1/32nd edge almost flat. This keeps the blades cutting longer.
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