I haven't read the entire thread so I am just going to respond to the original question.
The amount of time it takes me to cum is inversely proportional to the amount of time a) it's been since I have had sex, b) it's been since I have seen/had sex with my current girl friend, and c) how aroused the person I am having sex with makes me. I.E. if she's extraordinarily beautiful and it's been a while since I have gotten anything, I'll probably last about 30 or so seconds.
There is also the intoxication factor. I find the amount of time it takes me to cum to be proportional to the level of my intoxication. If I am hammered I really have to concentrate to get anywhere.
-Al
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