When my nephew was an air Marshall they were cracking the frames on their 357 sigs P229s at around 9000 rounds took less then 10 weeks to do that.
I had a change to buy my dept. issued Glock 22 I told them I rather buy a captains or LTs gun they haven't been shot a lot where mine had many thousands of rounds through. For a time period I was putting a thousand rounds per month through mine.
As Department instructor and armorer I knew who was shooting their guns and who was not.