It will be interesting to see what you find at 500 and 600 hundred hours. How long are you prepared to keep going after that? I'm happy to make a prediction, since I'm not the one doing the work-- the point of discernible microscopic wear with the one JICO stylus was 500 hours, but that is only the starting point. We still have the 'gap' between that first marker and when the stylus starts to mistrack or demonstrate audible distortion. Where that is on a timeline of play is what you are after, in addition to looking at what's happening to the stylus on a microscopic level, no?