In a different time and place, I plowed snow for the State of Montana and for a Ski area in Montana. . . both were part time, while working full time for the Ski area.
The primary factor that makes that time frame vary widely. . . from hours to weeks given the same road/weather conditions is whether the blade contacts the road surface or not.
In most places and snow country 99% of most plowing is done with the blade off the pavement, usually about one inch or more +/-, using a couple of 'pads' that ride on the road keeping the blade up a bit. This is done for several reasons - 1] 'Convex' lane markers glued to the pavement would other wise be removed 2] Expansion joints and Bridge Deck surfaces are virtually never on the same plane, so to avoid damage to the plow and its structure, the blades must be protected by keeping it off the pavement. 3] Road surface. . . uneven road surfaces and patched areas present the same issue as #2.
In the instances where the blade actually contacts the road surface, then the blade does wear quite rapidly. . .
IMO the 'snow plow blade' market that has been suggested is much smaller than the heavy equipment 'blade' market.
Also, knowing how at least one State Hwy Department operates, if the premium for a kryron blade was 10%-20% more, they would likely not buy. . . instead having the plow crew, during down time, hard surface the blades, since the only incremental cost would be hard surfacing rods. . . pads are hard surfaced during down time also.
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