Not including those weekday morning quickies (which usually last between 10 minutes to an hour, depending on how long we have) at least 3 or 4 times a week we have nice, long marathons of about 2 to 3 hours. We don't discern between "foreplay" and "sex" it's sex from the first touch or grab.
Then, there are the "it's not a quickie, but not a marathon, either" which usually lasts a little over an hour or so. We're looking at about 5-6 quickies, 3 or 4 "inbetweens" and 3-4 marathons and the random blow job here and there a week, all together. Of course, it varies from week to week. (Last week was only 2 marathons, an inbetween and about 3 or 4 BJs, due to a UTI and then a yeast infection on my part, and that was all after 6 days of nothing but him getting some, because of the issues. NOT our best week. We both get crabby and irritable when this happens. But, you can't really control UTIs most of the time.)
I have to be honest, I don't think we've ever had five minute sex. 10 or 20 minutes, sometimes, but no less than that. I like to warm up and really get into it. Even a "quickie" needs to last at least 10-15 minutes, (hopefully longer) for me. It's just what works for us.
My Man is a maniac and always working on something, (He spend the whole day today, a Holiday, painting the garage, he's been working on it for a week, and he doesn't stop even if it's dark or it's raining or anything) he's a workaholic, so sex is about the ONLY time I can get him to slow down and savor something.