How long can a human go without water?
this post was submitted on 09 Nov 2023
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Remember the rule of 3s for survival:
3 seconds without cat
3 hours without shelter?
I'll accept the others but that one's just cobblers.
No. If you leave your house for 3 hours, you die!
Assumes you've got poor clothing in danger Weather/Climate
Weather extremes. Blizzards, deserts, hurricanes, life rafts... If you're stranded on a cool summer afternoon, obviously you can be outside for more than 3 hours, but without shade you might get a sunburn.
It's meant as a survivalist priority list. Build a shelter, find water, make fire if you can. Food can wait until tomorrow or the next day.
Been there, done that. That's why I questioned the 3 hours thing. Then again my training/service was temperate and jungle.
Sure, and if you had done your training at a Golden Corral, you probably wouldn't have worried about food.
I've been outside for far longer than three hours without dying.
That one is about extremes.
If you are in sub zero Celsius temps without proper clothing three hours is plenty to kill you especially if there is windchill in play.
On the other extreme three hours in full sun with a heat index above 40 can cause heat stroke or dehydrate you enough to be deadly as well.
Still sounds implausible and far fetched. Why would you be outside without adequate clothing? (Also below zero can be fine in jeans and sweatshirt if the sun is shining and there isn't much wind). And in that case it would be more a heat issue and less like a shelter issue.
The other case also sounds more like a heat/water issue and less like a shelter issue.
"3s for survival" "why would you be in a survival situation"
Why would you be outside without having eaten in 3 weeks? Or drunk water for 3 days?
You're the only one
I've seen that before and the 3 hours without shelter always cracks me up. Someone really needs to come up with a suitable replacement for the 3 hours part.
That one is about extremes.
If you are in sub zero Celsius temps without proper clothing three hours is plenty to kill you especially if there is windchill in play.
On the other extreme three hours in full sun with a heat index above 40 can cause heat stroke or dehydrate you enough to be deadly as well.
Ahh that makes sense. Seriously I have seen all kinds of jokes and justifications but haven't really seen an actual explanation. Thanks.
Heat index above 40? That's ridiculously low. 80 degrees F and 40% humidity is an 80 index and that's perfectly comfortable weather. Heck, I used to work manual labor outside for 8 hours per day in a heat index of 136+. It wasn't fun, and I was hot as fuck, but I did it every day.
Sorry. I live where Celsius is used. I have no idea what 80F is.
I was talking about a heat index of 40C. I thought that was obvious since I mentioned Celsius in the previous sentence.
Apologies for the confusion.
The confusion is because you said "a heat index above 40", so I thought you meant the actual index, not the index of 40C with whatever humidity. 80f is 26.66c (sorry, idk if you use decimals in Celsius or not). The heat index of 136 that I used to work in would be 43.33c and 40% humidity, so about what your index would be. I guess it could be fatal if you didn't stay hydrated, but probably not in 3 hours. At least not for someone who's used to it. I did get heat exhaustion a few times when the temperatures rose to 46.11 C, thankfully never heat stroke. I hope it doesn't seem like I'm trying to argue with you. I'm just trying to have a friendly conversation. Sometimes it's hard to tell how things read on the other end.