I normally carry one strong side belt and a backup in a bag (Maxpedition Fatboy or Oakley Messenger) or weakside Kidney. So if you do 6 years, I got my first SERPA in '05 or '06, at 350 days a year for 12 hours you are right at 25,000 hours. I carry for more than 12 hours a day and I doubt I go 15 days a year without carrying. Throw in the second backup and 50,000 hours becomes reasonable. I also have a SERPA holster mounted to the nightstand for beddy bye time.