[quote=@Raxacoricofallapatorius]
"How long does it take to bleed out?"[/quote]

Depends on the wound. Elevated heart rate and arterial bleeding? Unconscious within a minute, easily.

[quote]"If you're stabbed in the heart, you don't die right away like in the movies, so how should I do that?"[/quote]

You kinda do though. If it's, you know, *IN* the heart. When bloodflow to the brain is constricted, you have only seconds before unconsciousness. When it's cut off entirely, the lights go out in a big goddamn hurry. "Before you hit the ground" sort of hurry.

[quote]"Screaming or no screaming?"[/quote]

Reflexive noises certainly -- air came in, air is gonna come out quick. Screaming maybe, depends on your killer.