Fun off topic story that comes to mind since I’m currently sitting here without a phono cart waiting for new styli to be rebuilt at Soundsmith.
It seems different designs yield vastly different hours. After about 3000 hours of use I sent my Strain Gauge stylus to SoundSmith to be checked since it must clearly be worn after all this time. Peter got back to me that it was not worn, and I used it for many years after that until it started sounding as mentioned above, spitty and sibilant. Peter in one of his videos mentions a customer that played his strain gauge approximately 6000 hours before needing a new stylus.