How long do effects of crack last?

Answer 1

A crack high lasts about as long as a cocaine high does (since crack is just a diluted, easier-to-smoke form of cocaine). Which is not very long. The effects of one line of cocaine, or one hit of crack, last about 20 to 30 minutes, and then you have to take another line, or another hit, to keep the high going. When you finally stop taking lines or hits, you'll start coming down (the feeling of euphoria will start wearing off) in about 20 to 30 minutes.

You'll still be able to feel the effects of the crack or cocaine -- you'll feel wired and jittery -- for about 18 to 24 hours, but you won't be high. You'll be coming down, which is the opposite of getting high. Basically, however great you felt when you were high, you will feel correspondingly horrible when you're coming down. The higher you get, the worse the comedown is when you stop.

Answer 2

5 to 15 minutes