how long can the human body go before dehydration?

Answer 1

about 3 days to a week...not very long..

Answer 2

As the first person who answered said, it depends what you're doing. If you're moving or sweating alot in a way, you'll dehydrate rather quickly. If you're doing seemingly nothing, you'll last for a while.

Answer 3

I would really think that would depend on the conditions. For instance, if you were sitting on your butt, doing nothing, you might last a week or so without water.

But, if you were walking across the mojave desert in the middle of the summer, you might not last 12 hours.