No, not the length of their schlongs (I've already addressed that in "The Myth of Moby Dick") but the length of the sexy time.
I'm a hit it and quit it type of girl -- I like it hard, fast and wet. But some guys think a girl wants slow romantic sex that lasts for hours!
Once I had sex for about 16 hours straight -- of course we did it with the aid of pharmaceuticals -- but after an all-night sex sesh, not only did I emerge from the room with the biggest beard burn you've ever seen (I looked like I had a chin herpe), but a bangover that lasted for days.
Now, I'm not saying I want a 60 second man, but I like a guy who comes hard and then cums hard in about 10 minutes.