3 minutes without oxygen. 3 days without water. 3 weeks without food (I think it is also “3 hours without shelter” but that is a much more environmental factor and feels shoehorned in). And, depending on the apocalypse, clean air can be hard to come by.
If you are going that route: Rule of 3
3 minutes without oxygen. 3 days without water. 3 weeks without food (I think it is also “3 hours without shelter” but that is a much more environmental factor and feels shoehorned in). And, depending on the apocalypse, clean air can be hard to come by.
I’ve heard it phrased “3 hours without shelter in inclement weather”.