Bill Tindall, E.Tn.
Refreshing the edge is about 15 seconds on a diamond hone

Is this refresh at 25 degrees?

Do I have this right..........?

primary bevel 20 degrees established by hollow grinding,

secondary bevel about 25 degrees established by diamond hone

tiny convex edge established by buffing.

Philosophically, 20 degree primary makes for easy establishment of 25 degree and renew at 25 with fine diamond. ? .

Tiny convex bevel provides strength but easy to renew at 25 degrees because the 25 degree bevel is short. ? .