How soon after a break up do you move on to the next partner?

A friend of mine is going through a crisis in her relationship and she sees it as being pretty much over, but it's not officially over yet. She's ready to make a new start by sexing someone new while still in this relationship. This is a funny one to me cause of who I am and the fact that someone asked me this had me rolling. My thing is this...... You know what? Tune in to find out what the answer is!!!! LMBAO!!!!!!