If its a Glock,.... Hawkfish will be posting shortly,...

However, many on this forum who shoot in competition, or range time to the max, will attest to thousands and thousands of rounds through a barrel.
My personal experience, is my grandfather's 1891 Argentine Mauser, there is no way to calculate how many thousands of rounds that have been fired before I have shot an additional 1000 through it. BUT it shoots as good as I can aim, and has never let me down.
9mm, you should have no issues for a long, long, time, and be a helluva shot!