Data visualization expert and maker of cool infographics Randall S. Olson recently came across a fascinating study on male orgasm times that's currently behind academic paywalls. Being a lover of science, statistics and stuff that people are interested in, Olson poured the data the scientists collected—from 500 heterosexual couples across Europe armed with stopwatches and sex journals—into some startling graphs showing the distribution of how long men kept the motion of the ocean going.
The stopwatches were very important: the recorded results were 1.9 minutes shorter, on average, than when men simply estimated how long their intercourse had lasted. How long was the real average? 6 minutes. That means that the average guy, Olson points out, was overestimating his time by 31%. To be clear, the "start" time was penetration, and the "stop" was male orgasm (this is known in the biz as "the Victorian Special." It's not, actually, I made that part up).
But, of course, a 6 minute average isn't the whole story. Most men fell in the 4-11 minute range, but the total range of completion times ran from 6 seconds to 53 minutes. Here's one of Olson's two distribution charts, which makes the wide range of normal and the even wider range of unusual apparent. This will probably make you feel pretty good for a few minutes before you start comparing yourself to the long tail.