How much time does it take to bleed to death?

On a unrestricted open vein (like the aorta) the heart can pump approx .07 ml of blood per pump per beat at an average of 72 bpm is a total of 5.04 liters. If the body contains approximately 5 liters of blood, exsanguination comes in about 1 minute. Death is probably a little later due to endorphins and adrenaline.