A hard question to answer, all my reps are in rotation and don't get a lot of wear. I have12 or so now. (have owned around 25)
I am also quite careful when wearing them and leave any rough activities to my gen Deep Blue,G Shock or Luminox type watches.
I have not had a failure yet.(touch wood)
Mind you I have never kept a A7750 movement watch long enough to have it fail(several Pam GMT's)
Never bought any A7750 chronos either.
My longest owned rep is about 4 years, and is one of my most accurate timekeepers.
An Omega UPO.(Swiss movement)