Any idea on what specific model of KMC?
On a singlespeed bicycle I once had road salt that fret up pin ends causing link to break.
I walked to nearby city repair place, they replaced the chain and the replacement lasted 5 weeks, while I was used to 6-8 months. Go figure. After replacing it with same model/type chain as before and always, it went back to 6-8 months.
They might call it "about normal", yes, for THEIR choice, they don't tell you and they don't ask.