Originally Posted by Dan333SP

I Strava-stalked the guy with the top time on that segment. He's averaging 280 miles a week, he's a fairly competitive Cat 2, and he did that time in the middle of a 90 mile ride. He averaged just under 310 watts for the ~13 minutes of the segment, which isn't off the charts in power terms, but is way stronger than your average recreational rider is capable of. To get to that level, it would literally take years and tens of thousands of miles of training. And, depending on genetics, there's no guarantee that any given rider can even get to that point.