On file medically, whats the longest that a male and female had intercourse?

I found on the Information Superhighway (Internet) that it was nine hours. But, I'm unsure if this was an official record, that there should a record organization for what I trust is just this: a gift from God for married couples. (See in the Holy Bible Genesis 2 where it talks about God commanding the first couple to "be fruitful and multiply the earth.") You don't have to though!