I hear that the Chineese 12K takes 50 laps to polish the edge, but the Naniwa only needs 10-15 laps. Can you make 50 good strokes with no pressure ?

ps: In addition to your stropping, also take a look at your shaving angles and face prep. Using too upright of an angle will dull your blade much faster than usual. Wetting your face, lathering, leaving the lather on your face for 2-3 minutes to soften the stubble, and then relathering (partially dry lather doesn't shave well) may also help keep your blade sharper longer.