"Only the Shadow Knows", but using production loads, no steel cases or bullets with steel and various coatings, it'll be until it loses accuracy due to bbl rifling wear. Using Production class loads, it won't wear very fast at all. Parts WILL break, but most are easily replaceable.
P.S. The CGW Race hammer isn't legal in USPSA/IDPA, but the CZC Competition hammer is legal. It also gives those great results with improved hammer hooks. The hammer is the biggy. The SR disconnector is also another great improvement.