Silver Blues, I can get no less than a couple weeks if I want, but I seem to swap blades weekly out of habit and routine. I tried some of the Excalibur tricks people do, and that didn't really offer any real longevity help to me, but what did work was keeping a real wet lather. The wetter and slipperier the lather, the easier the blade cuts and the longer it lasts.
Is one pass really possible?