Originally Posted by
Machka
Just for informational purposes, a "Double Century" is 200 miles completed as "all at once" as possible. Reasonable breaks are allowed, of course, but if you do a century on Saturday, and another century on Sunday, that's called a "Back-To-Back" century, not a "Double Century".

I've heard these "back-to-back centuries referred to as "Twin Centuries." This was back in California in the 70's. I think twin century is a simplier and easier name.
Also, despite my preference for distances in metric, I like the Imperial nature of the "Double Century." I think miles are more appropriate here.
L.