Whilst it's logical to suggest the more you use it, the quicker it wears out, AIUI this isn't the case with normal running of desktop drives.
Power cycling is the major issue; the more you power cycle the drive, the quicker it dies. From the drive, I fished out the number of power cycles my drive has done in just a few months - it was astonishing.
FWIW, I also learnt that in my RISC OS box on the top slice, my drive runs at a toasty 47 degrees. I actually cut it down (from 51 degrees) with Unipod. That's not due to anything clever - merely the fact that with it I got a rounded IDE cable in, and removed a USB card, NIC and IDE card and replaced it with a single board, so more air throughput was possible. Those figures are presumed to be correct, but the software used is still in development.
However, as I've said, the take-home message is NEVER use old drives for anything other than non-essential storage (NOT BACKUPS, because when you come to reach for your backup...) or doorstops - otherwise you ask for what you get.