5 mins max. But the reason is that we arent interested in turning it into a long drawn out fuck session. We leave that to her lovers. She makes a point of slowing them down, stopping, starting so it also raises the level of the eventual climax. There is also more time so they get to cum twice or 3 times.
With me, we need to get to work, gym, class, etc. So its hurry up and cum! Then of course, if you are sloshing around in Mr Big-dick's cum and listening to how great he is, its a miracle I even last 3 mins...