I took my bike in for its 90-day tuneup this week. I've ridden it more than 1,400 miles since I bought it at the end of March. My other bike, the Novarra Randonee that I used during the first part of my training, has more than 700 miles on it. It's incredible to think I've ridden 2,100 miles since February -- that's like going more than halfway across the country!
I actually had to get the chain replaced on my road bike. They said the chains on those bikes are wearing out abnormally fast (probably made in China - then again, what isn't these days?). I've never ridden a bike far enough to need to replace a chain on it.