Most of the 45ACP ammo fired at Camp Perry is for Bullseye shooting in conventional matches. This is typically a 185 or 200 grain bullet fired at about 800fps. These are light target loads and a gun of good quality can be expected to last a lifetime. A barrel will last about 500,000 rounds if lead bullets are used primarily. A spring will need to be replaced every ten years or so. Perhaps the slide will need to be tightened every ten years or so, but if you use the right lube and the job was done well in the first place, it probably won't.
When shooting hard ball 230 grain ammo, the longevity is much lower and guns should be magnafluxed every five to ten years, depending on usage, to check for cracks that could presage a dangerous condition, such as a slide fracture.