1-2 hours to change the edges Mr. Maltby. When you let accountants run your shop, this is what happens. When the openings are less than 2" in height, all you can do is snow removal, but this also removes the crush that provides traction. I told the shop foreman I was going to run around all night with the blade in float to burn the rest of the edges off and he just shrugged and said, "do what you have to do." It was a very long night.
Geo