"Endurance Cycling" might be more apt, I think; because it should encapsulate the fact that most centuries and brevets are timed events, whereas touring is self-paced.
That's an excellent point. I tried to affect that same idea in my comments that noted that
any distance can be
considered long depending on
one's current ability or the conditions of the ride.If you're on a scheduled ride,
you must endure, if you are touring, you simply adjust your route or schedule to your comfort.