I have 925 miles on my Std 2011. I changed the belt and it looked and measured as almost new.
The reason I changed it is I was heading to CO for a week way in the boonies and didn't want to worry about it. If I had been staying close to home and around dealers i would have kept on running it.
Now I know what to expect my belt to look like after 900 miles and have a spare. This one I will run twice as long and look again.