The message
from John Rumm contains these words:

It also depends on the type of disc in use. With an abrasive you will
soon get the stage of needing to rotate the work even if you don't at
the start, so as to get full usage from the disc. This would not of
course be an issue with a diamond disc.

Though my current 330mm chopsaw blade has gone through 20 slices of 50 x
3 square box, dozens of bits of 50x5 flat and 50x50x3 and x5 angle and
is still not fully through.

--
Skipweasel
Pay no attention to that man behind the curtain.