43-year-old Jens Voigt was successful in his Hour attempt, and blew the prior record of 49.700 kilometers out of the water with 51.115. That’s 31.761 miles.
Just by way of comparison, I’ll add a stat of my own. I am an enthusiastic amateur, nowhere nearly the fastest person I ride with, but I’ll put this out there: GarminConnect tracks a few metrics, and one of them is your best time over 40km, which is 24.85 miles.
My PR over that distance, set during the Katy Flatland ride in July, is 1:14:46, at an average speed of 19.9MPH. Voigt covered 40 kilometers today in a hair under 47 minutes.