Miyabi 47 cartridge: How many hours does it last ?

Given that cartridges like this are more or less hand made and must have a degree of variability in construction and usage and associated gear will vary so much I doubt if just having the approximate usage time would tell you much. I have seldom or never worn out a cartridge but then I don't do speed dating either; the magic is all in your ear. Given a well constructed stylus and cantilever it SHOULD last longer than this but only you could judge.

I have had two cartridges re-tipped by Soundsmith and BOTH were total disasters.Both were Denon 304s. The first I loaned to a surgeon friend and the cantilever broke off in the first week of use. I thought it could have been his fault so I later had another done; the suspension failed after a week and REPEATED messages to them have never received a response. It looks to be in perfect shape but simply collapses when lowered on the record. I have had some other experienced audiophiles look at it under microscopes and they can't figure out what is wrong either. I sent an AT OC 9 back for a retip [$150] and they simply said it had half its life left, cleaned it and charged me $75. I would liked to have made that decision myself. In about 50 years the only cartridge I ever recall damaging myself was during a group marathon listening session at 2 AM and I knew it the moment I did it. I will go elsewhere next time.