Solo sawmiller in action. Low cost lumber. 

Hi Richie. It varies a lot depending on the hardness of the timber, and how clean the logs are, and whether bark was removed (depending on time of year and weather, debarking can be very easy or almost impossible for me). So anything from a few hours to about 8 hours out of a new blade. I found that the bi-metal blades would get dull much more quickly after sharpening than when they were new. I suspect the heating of the tip by the electric sharpening disc may affect the heat treatment. Also, I am currently cutting some very dense and hard eucalypt timbers that are difficult to debark, and have pockets of dirt introduced via insects into the core of the logs. These are needing a lot more sharpening, sometimes after each log, so I have gone to tungsten tipped blades. Glenn