Do you think your personal experience with distance training (running and cycling) are a benefit when you apply that experience to distance riding?
I know my own perception of distance is good because of having covered similar distances on foot.
I only ride LD's (lots of old injuries) but I do head trips. "Good grief, the Redwood Ride is just the Pear Blossom Run - done twice." Or "After all, Hasso (in his early 60's) does a century every Saturday." Guess I can ride Headwaters - don't even have to pedal.