Dissertation... Chuckle
200k ooof. I certainly wouldn't have the legs to do that now, let alone later. Have never ridden that far in a day that's for sure, let alone an imperial century, although have come close to that a bunch of years ago, but that day had some good climbing early on and later I hooked up with some roadies and hammered it too many times.
One day perhaps will try 160k but pace myself properly..... One day one day.