At moderate temperatures and humidity you’re good for much longer - about three days I think. In the hot dry air of the desert it “wicks” away a lot faster.
Their was a history show on awhile ago about these three guys lost at sea in their boat with nothing to drink etc. They finally risk the natives of Africa in search of water. Still no water (desert), and instead they got picked up by slavers, etc.
They drank their own urine in the boat, which once or twice did some good. But on the fourth time around it was dark brown and with no water left in it! (YUCK!) Once the slavers took them they only got a little water when found. But they were able to drink the camels’ “fresh” urine! (Yuckier!).
Terri Schiavo lasted 14 days without water. Think of all the resources that could have been saved if they'd dropped her off at this place.
And I note this guy's death was so incredibly peaceful.
In all seriousness, this is very sad.