Well, with sharpening any tool, bench tools included, the freshly sharpened edge degrades pretty quickly by a certain amount, then keeps a "working" edge for much longer. Since I do all of my roughing with scrapers, when turning bowls, I may get a couple of finish cut passes with a tool before needing to go back to the grinder. I never use a honing card. I have lost too many of them, and with my grinder rest, it takes seconds to refresh the edge.
robo hippy