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@4idan
i dont have the foggiest why it would appear to be 2hrs. I get the maths, i was just trying to work out the physics.
the argument about doing the hills faster because your going slowest on them longest seems good too. my point was more about wether it makes sense from an energy efficience point of view too. its all well and good to say you should try harder on the hills/headwinds, unless the boost to your speed is gonna be relatively small compared to the extra effort. is the exponentially increasing air-resistance in a head wind ever going to make the extra effort a waste, better spent evenly across the whole course?