Been skating on the 90/75 FBV for a while now and love it. Two question 1. Most people say the sharpening last longer then regular sharpening, but for me i feel like the sharpness feels really sharp for an hour, then kinda in between sharp and dull for 3 hours then after that it needs to be sharpened again or i feel like im a sliding everywhere. For regular sharpenings i felt like the period of between sharp and dull takes a lot longer 6 - 8 hours. Is this just me becoming a better skater and wanting sharper blades or what? Anybody feel FBV requires more frequent sharpening. 2. Accorsing to the blackstone videos sharpening should only take a few passes on each skate. My sharpener takes twenty minutes to do FBV. Should it be taking this long or what, how long does your FBV take?