I have a window. I can stay hard for as long as I want to regardless of orgasms, provided I continue having sex. I had sex through the entire movie Troy recently, including the credits and about 15 minutes of continued "Bonus Material Menu Music". However, if the sex ends for about 5 minutes, so does my erection. Now I can be ready to go again in about another 5-10, but there needs to be some "cool off time" between.
Google "The Coolidge Effect" if you're curious about this. I wrote a paper on it back in college. It's pretty good information to have in your arsenal.
~Steve
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