IMO, this is pretty cool...

On Sunday, pro gravel racers, Jeremiah Bishop and Tyler Pearce (aka "The Vegan Cyclist), competed in the Belgian Waffle Ride in San Marcos, CA (127mi). The next morning, they set out to ride from San Marcos to their next race - Sea Otter in Monterey, CA - dubbing it the "Belgian Otter Ride". Their route has included some dirt sections, as well.
Day 1: San Marcos - Santa Monica (112mi)
Day 2: Santa Monica - Solvang (150mi)
Day 3: Solvang - San Luis Obispo (92mi)
Day 4: SLO - King City (110mi)
Day 5: King City - Monterey...happening now

It's not the hardest thing ever, but it's a pretty good effort.

Last year, Pearce completed the Silver State 508 in under 30 hours and took the title of US Ultra Distance National Champion.