How Long a Period of Going Without Water is Unsafe?

On a mailing list someone is saying his wife will be going on a vision quest without food or water for four days. Four days without water seems dangerous to me. Anyone know?

this site claims 3 days in the wilderness without water Not sure how long in a more hospitable environment. 4 days without water under any conditions seems like it presents a fair chance of severe complications.

I think she’ll have a vision, and he could probably start dating.

Unless you mean she isn’t taking food/water but can utilize what she finds/collects/kills?

Rule of threes:

Three minutes without oxygen, three days without water, three weeks without food = you are dead.

Obviously there are a lot of outliers and such. But going three days without water is an extremely bad idea no matter how awesome you are.