Thanks for your question. It answers a question I have had; the one about "are there stupid questions?". Unless of course you are under the age of 13, in which case I would have to say it depends on too many factors to answer reasonably. These factors are amount of fluids comsumed, exertion, external temperature, humidity, age and many more.
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The sweat rate, that is the amount of sweat lost in on hour can go up to 3l. It is normally below 1 Liter, but it depends on the surrounding temperature, humidity, level and intensity of the activity.