I know for a fact that my sister knows the answer to this question, but for the rest of us... (inspired by the Lexus and BMW that the people at the end of the street down from me own, who rent a SMALL TOWN HOME in a nice but not that nice neighbourhood, and all of whom are under 20 years old... hmmmm)

How freaking long does a car alarm scream for before it shuts off
(sans hitting the deactivate button)?