A general guideline for carbohydrate consumption during endurance exercise is

to consume nearly 30 to 60 grams of carbs per hour

Explanation:

A person doing exercise or involved in sports must intake appropriate amount of carbs to maintain the energy. In general, it is recommended to take at least 6–10 g/kg of bodyweight. Or it can also be interpreted as taking 30–60 g carbohydrates per hour i.e 0.7 g/kg . Adequate amount of carbohydrates helps to maintain blood glucose level . After the exercise, an athlete must consume carbohydrate in the range of 1.0–1.5 g/kg of bodyweight.

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