I've done two so far. One was solo on some extremely uninteresting terrain. Averaged about 17.8 mph, and the last 10 miles were the most uncomfortable on a bike I have ever felt. Stopped once long enough to eat a Stinger Waffle. Second one was with a group of friends in an organized event. Averaged about 16 mph (I think it was slower due to 4 stops at rest stops - BTW, PB&J is the ultimate nourishment food) as well as rode through 4 torrential downpours. Finished feeling strong.
They get easier, and riding with people always makes the riding better. Congrats and sign up for another one soon!!
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Wut