Does this count?
https://www.strava.com/activities/718263879
It does list some climbing, I think with some rolling hills near the start of the ride...
70 miles (just over metric century), and 6,616 feet elevation drop.
It lists climbing at about 2,976 feet, but add that in, and one has nearly 10,000 feet of descending.
I'm not quite sure why my speed wasn't higher. I was hitting 40 MPH on some of the descents. Loaded. I also had a radial tire wire in one of my tires causing slow leaks and pinch flats, and being hard to locate.