Welcome to the forum, Ian. You have come to the right place.

How long will the edge last on your ax? I don't know; however, here is a thought:

This thought started with thinking about truing my grinding wheel. I think it can apply just as well to ax edges. Please cut me some slack with the math portion; it has been over fifty years since my high school math classes.

Imagine a two axis graph. The vertical Y axis represents grinding wheel trueness or edge sharpness. The horizontal X axis represents usage time. Start with fresh truing or sharpening, 100% on the Y axis. The X axis starts at zero usage time. Record sharpness points at consistent usage periods. Do this long enough to record several sharpenings. Tally up all the sharpness points to calculate the average sharpness.

Each time you sharpen, the vertical point returns to 100%. Frequent, light "touch up" sharpenings will translate into a higher average sharpness. For a non math person like me, that means easier, more pleasant cutting.

That's my not very scientific idea (which might actually work). Your Tormek is the ideal tool for controllable, repeatable sharpening. You need sharp tools. Try the program. Tormek and Gransfors are both respected companies; the program might work.

Keep us posted.

Ken