3 weeks without food, 3 days without water. Then, dead. But, as that goes on, you get weaker and weaker. That last 3rd week without food, that showshoe rabbit might just beat your own ass, right there in the snow. With your own club.
Survival is about "not getting into that deficit." Hydration is all about not getting dehydrated in the first place... As soon as you feel like "I'm thirsty" - you're already dehydrated... Snow everywhere in the winter? No worries about getting dehydrated, right? Wrong. Don't eat it - it'll immediately chill your (valuable) body core temperature. You have to boil snow, melt it, make it "water." That means you need to have fire or heat - to make snow into water... Or... just kill yourself and crush your body core temp...
It's not about time. It's about staying ahead of that time, staying ahead of that game, and keeping cool about it, when it's not really working out at the minute. THAT is what survival is about.
Not to compound that with cold weather, hot weather, desert weather - all tasks become more difficult.
This thread shouldn't be about clothing... Please discuss, with real information, everyone...