"Ecstasy's effects last 3 to 6 hours. It is a mood elevator that produces feelings of empathy, openness and well-being. People who take it at all night "rave" dances say they enjoy dancing and feeling close to others. It does not produce violence or physical addiction."
Beck, J. and Rosenbaum, M. "Pursuit of Ecstasy: The MDMA Experience." Albany: State University of New York Press, 1994.