To do 103 Km is a great feeling. I had thought the benchmark of a century ride was the American standard of 100 MILES. That is about 60 KM.?
Often really good cyclists scoff of a METRIC CENTURY as a cop out.?! Is the Ameican 100 mile standard some kind of benchmark elsewhere ??? Probably in the rest of the world, good cyclists do not think of 166 KM as some kind of benchmark, only in the U.S.
Of course this is during a hard Saturday ride when everyone's adrenlin is up and the competitive spirit is at its peak. If only the U.S. would grow up and accept the world metric system as superior, this question would be moot. But seriously, 66 miles American per day is a great feeling, as long as you stay awake to tell about it when you get home.
Maybe in metric countries a REALLY challenging day is two metric centuries.? Of course, you even hear of 3 English mile centuries- U.S, nonstop.
Crazy, but be proud if I could do it.- What 480 KM. Some kind of endurance thing ! That is like the distance from Detroit to Toronto. How long would that take. certainly not 24 hours.

Metric= mile conversion; 1.6 Km = 1 mile.