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You lose between 1-2L/hr of moderate exercise. To stay fully hydrated and performing well, you would thus probably want to drink 5-10L ish on those hikes, leaning towards the high side if it's hot and arid.

You certainly can get by with less, but that's not the point.

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1-2L/hr is ridiculous. No one would be able take any reasonable hikes without bringing a burrow with them. 15 mile hike is roughly 4-5hrs across rough terrain. I've done tons of of them without any signs of dehydration.

You generally aren't cooling down through sweating alone, so those figures sound a little high. I can't really come up with anything that would make me drink 10L and still qualify as 'moderate exercise'.

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