That video is the Gravel Locos-Hico (Texas)
We did that one twice. On the very first one they hosted no one knew if anyone would show up because we hadn’t heard of it. But 20 pros and 1000 total riders showed up! The next year 1700!
Turns out it was the perfect warmup for the Unbound in Kansas for the pro riders.
To put it into perspective we did 70 miles in 6 hours, the pros did 150 in 71/2 hours. They averaged over 20 miles an hour on gravel roads, crossing 3 rivers and 5000 elevation gains only stopping twice for water.
Crazy!