The small time gap between safety and danger. Can be used to define how long you have before someone turns angry, or before a fight breaks out or just for Shits and giggles when playing chap door, run.
Person 1: I just split with my girlfriend.
Person 2: sorry to hear that dude, how did she take it?
Person 1: don't know yet, waiting for her to reply.
Person 2: wait, you didn't do it to her face? You got maybe a 20 second gtfo period before she hunts you down dude.