The blades were ground over about a three week period between actually finishing a couple blades. My local friendly heat treater told me to bring him lots of blades at once instead of a couple every couple of weeks.Seeing how he won't charge me (really nice guy) ,I do what I'm told. He really likes knives and says it breaks up the boredom of doing tiny industrial parts day in and out. Every blade is a different style of hollow and flat grinds. It was more work coming up with ideas than grinding them.
By the way, I use a Bader II and a Grizzly with 8" and 10" wheels. The Bader is my dedicated flat grinder although it has extra tooling arms and various wheels. (life sucks)