A person must lose about 20% of their blood volume to lose conciousness from blood loss alone.KD5NRH wrote:ISTR Applegate did some studies on this for various cut locations. I don't have the book handy, but IIRC, three minutes was well beyond loss-of-consciousness time for virtually all of the cuts, and beyond the death time for several.fm2 wrote:How long does it take someone to bleed out from an arterial knife wound? 1 or 2 mins. ?
If you're unconscious, it'll almost certainly take responding officers a couple more minutes to prepare for and make entry, possibly another minute or more to find you, and then you'll be receiving minimal first aid at best until the ambulance crew arrives.
For an average size man (about 180 lbs) with an arterial wound, this takes about 12 seconds.