This is the first bike I've ridden that far (and this in 13 months), so I really have no experience, except to have read that chainrings "far outlast" cassettes. My first cassette was good for 12,000 miles, so I was hopeful of 20-30K from the chainring. Naive, huh? I will be replacing it routinely now at 12,000 miles, I think.
Would love to know what the "normal range" for a chainring is. Recall I do most of my riding on that middle ring. But if mine lasted an exceptionally long time, it's just more proof I have no power!
Even my chains go 4000 miles.
So, again, what's "normal?"
SIDE NOTE: The LBSs in the area have none in stock. As one noted, their average roadie customer might ride 3K in a year. At that rate, it would have taken several years to wear out a chainring, and by then, they've moved on to another bike. It's always special order.