Sex and Length *heh*

So my friend Eric Meyer noted the other day that the phrase “three-minute wonder” may in fact be overlooking the idea that some women like partners who get off quickly.  Which is true.  I’ve known more than one woman who complained about some bohunk pounding her cervix for hours at a time, overstaying their welcome.
This leads to an interesting question: What’s your ideal sex time?
I know, I know, it all depends on the mood and the partner… but I think most of us have a rough time we settle into.  As my wife is so fond of noting, I’m extremely girly when it comes to bedtime activities; I like lots of snuggling and foreplay, so in an ideal situation it winds up being about twenty to thirty minutes of hot making out and other activities, and then about ten to fifteen of the whole PIV stuff.
(Is it just me, or is “PIV” perhaps the least-erotic acronym ever?  “Penis in vagina” just sounds like Animal is describing sex to Miss Piggy.  “PENIS IN VAGINA!  PENIS IN VAGINA!  EAT DRUMS!  EAT DRUMS!”)
So for me, satisfying sex winds up being about forty minutes long from start to finish.  Interestingly, you’d think my blossoming Dom tendencies would make this shorter, since I’d be more selfish when I’m just flinging my partners onto the bed, but then the actual PIV bits take longer because I’m abusing them when I’m doing so, and that’s distracting to my actual finish.  So either way: about forty minutes to an hour.
The question is, I guess, what sorts of sexual time work best for you, as a default?  If your ideal partner came and went at your command, what’s the range you’d be looking at assuming you had sex often enough to form a sort of baseline?  Is, perhaps, the three-minute wonder the better lover?