Don't know of any but practice makes perfect.
Besides the point of gradually upping the milage- Think of Nutrition and bike set up to go with it.
You do not have to do mega miles in training in one hit to train. Find hills- Get speed in on a 20 mile ride- and just gradually up the milage on your normal training rides. I think it is pointless to do 65 miles training to do a 65 mile ride. 25 miles up steep hills is just as good or even 20miles at just 2mph above your 30 mile speed on a flat course.
Nutrition is something else so get to 40 miles and come back on that one.
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How long was I in the army? Five foot seven.
Spike Milligan