@cute_otaku dude, if with a sword or with a dagger, you wont die 1shot, not even if your head is cutt apart, becouse you die mostly from bloodloss. or you die becouse of the shock. so much to reality.
if you get stabbed in the chest were the heart is, you die eitherway and you wont even need 1 foot to reach it. but even this not in an instant, instand just if you die from the shock, and here would it not play a role what stabbed you. and if you hit the lungs, than you would die from drowning or loss of air.
if you stabb in the belly or cut it open, you stil wont die so fast, a bellywound is one da** slow way to kill someone, the person would need days.....if the intestins are not damaged to badly, but even if they were, you would die mostly from the bloodloss, or the shock.
and your neck kills one fast, nope. you die RELATIV fast becouse there is the artery and you die in some minutes from bloodloss (and this is fast, belive me) or you drown in your own blood, or suffocate to death from airloss. but each will need at last several minutes.
dont take movies as example, there ppl die even in seconds peacefully if they take a overdose of sleeping pills, but reality looks different, you need hours to die from it, and it will be realy painful hours. humans die sometimes too fast, but are mostly hard to kill.