What is the longest you've ever gone during sex?

I've never timed it. I've tried to but I get so caught up in it all that I forget to keep track of time.

alittle over an hour

Foreplay to finish - 4 1/2 hours. - K

There have been many times when we start around 10pm as my son goes to bed at 9:30 and we finish up around 3 or 3:30am. It is well worth being tired the next morning.

Longest session in my life?
I wasn't timing it, but my own orgasm count was over six and given that it was vaginal intercourse interspersed with oral sex, more than a few hours would be right.
When I was much younger and didn't yet have a place of my own, my GF of the moment and I would occasionally get a hotel room and spend nearly then entire time having sex, only taking time out to have something to eat and drink. So that would be nearly a whole day... LOL

with foreplay and every thing included no longer than an hour, but we start and stop if we have the time, but just humping not much more than 20 minutes sadly!!