According to Yahoo, my inaugural training ride was 16.2 miles. The mile markers along the route suggested it was more like 20, but still that seems like a pretty good ride. I covered the outbound leg in 30 minutes, and the return in about 45. I had the wind against me coming back and I was starting to feel the distance by the end of the ride.
I added some more lift to my saddle and that made a lot of difference. The few small inclines I came to were easy to do without even changing my cadence.
That felt really good.