hi roy you may wish to carb load leading up to the event and you may wish to invest in some of the endurance gel products on the market they will give you a sustained release instead of a quick hit you also may wish to purchase one of the carb supplements you can mix to make up a liquid supplement that you could carry with you in a camelbak.more carbs you can get in the better as any activity over that long will be gruelling on the body better to use carbs as an energy source instead of your body going catabolic and eating into muscle .good luck need any more info drop me a line


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