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Gastrointestinal distress. Such a lovely all encompassing term, right?

Most guidance calls for between 30g and 60g per hour and this is a sensible starting point for most endurance athletes. If you expect to be still moving after 2.5 hours, the 60-90g/h range is probably more suitable

The answer to this question of how much to drink is both staggeringly complicated, and unbelievably simple.