Google rocks
Found Here
Question:
Can you tell me how long, for a normal man, intercourse usually lasts? And how many times a day can I have sex?
Answer:
March 26, 2001 -- Not surprisingly, there isn't much solid scientific information on the average length of intercourse. It doesn't lend itself to direct instrumentation -- most couples aren't that interested in knowing -- and estimates by couples from memory are notoriously unreliable. Nonetheless, among researchers over the years, there's agreement within a general range. Kinsey's surveys found that 75% of men lasted less than five minutes, and quite a few lasted less than two; Hite found that 62% of men lasted less than five minutes; and Masters and Johnson more or less agreed.
But you may be concerned that you ejaculate prematurely. First, I prefer to use my definition of premature ejaculation: ejaculation before you and your partner wish it. Notice that I use the word "and" rather than "or." It's not unusual for a man to imagine that he should be able to postpone ejaculation indefinitely. Let me assure you that few can, and even fewer women would care to have that sort of endurance sex. Too short a time can certainly be a problem, but, beyond a certain point, more isn't necessarily better.
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so all the studies point to you guys being either unusual or liars. At any rate you're certainly not average....(No offense... I certainly haven't had sex with either of you so have no way of validating or disputing your claim)