all the research I've done says to eat/drink about every 10-15 mins switching between water and electrolyte mix about every hour. (ie: water first hour, electrolyte next hr etc). I haven't tried long distance yet so have Not a clue if it works but makes sense to me. I also liked someones idea about cutting up the energy bars into bite sizes pieces hanging in a baggie on the bike. Nice reminder to eat and the perfect size to eat often. I do like the idea of the Red Bull - especially now that they make a sugar-free one. Anyway - thats my 2 cents worth and good luck.
Life should NOT be a journey to the grave with the intention of arriving safely in an attractive and well preserved body, but rather to skid in sideways, champagne in one hand, strawberries in the other, body thoroughly used up, totally worn out and screaming: "Yeah Baby! What a Ride!"