Actually, averaging 63 mph for 24 hours is done fairly frequently without undue speeding. True, you can do it only on freeways (or other fairly empty straight roads with a 65-up speed limit, and it helps if you are on the west side of the country, where things are less crowded. But I've easily managed WELL over 63 mph for many hours on some of my rides. With a five minute gas stop every two hours (for a small tank) it takes only an overall average of 66 mph to keep your speed over 63 - like I say, when you know what you are doing, and that means how not to waste your time, it's not that hard.
I'm sure you've ridden long days. But you clearly do not know how to manage your time on your rides, so you don't think it can be done. I practice on every long ride I take, so I know very well what I can do and what it takes to do it.
By the way, anyone who pulls out the "political correctness" nonsense has, in my opinion, shown that he doesn't have any valid arguments.