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A human being can survive an average of three to five days without the intake of water, assuming sea-level altitude, room temperature and favorable relative humidity.  In colder or warmer temperatures, the need for water is greater. Need for water also increases with exercise.
As you said Joe, Oxygen ~ 4 minutesThen there's Sleep ~ 9 days (people start to hallucinate and can die!)Is there anything in between?
As you said Joe, Oxygen ~ 4 minutesWater, of course, is very important. I am surprised that so few people have ever taken the time to figure out what is really most important to life. Thanks for comments. Joe L. OganThen there's Sleep ~ 9 days (people start to hallucinate and can die!)Is there anything in between?
We can assume a conscious, resting/sedentary, average, healthy adult. And we can start with absolutely nothing ... an environment utterly devoid of everything. ~0 seconds. STP (Standard Temperature and Pressure). We seem to always need atmospheric pressure on our bodies (different from oxygen to our lungs) and a certain amount of heat -- otherwise we're in outer space! And we couldn't breathe in oxygen without the outside pressure, otherwise we'd explode. ~4 minutes. Oxygen. <1 day. Voiding. We need to urinate and defecate at least once a day. ~3-5 days. Water.~9 days. Sleep. ~11 month. Food. Then there's literally our senses. How long can a person go with sensory deprivation? How long could someone live without moving a muscle (except the essentials: heart, lungs, intestines, etc)? (PS -- I bet NASA had this all figured out a long time ago.)