My Manifesto: The Incoherent Ramblings of a Madman

Ok - stupid rhetorical question time:

Say your director is there, or say, any type of work superior, ah hell, say any person what is in the toilet making small talk while urinating into a urinal, as is done, how long do you wait after having finished urinating yourself to continue and finish the conversation that was started mid-urination before it becomes rude to continue being there while said person is still urinating?

Do you wait until said person is finished talking? Do you wait until finished person is finished urinating? Do you just end the conversation abruptly as soon as you finish urinating? Do you politely say I'll see you later? Do you offer to help said person shake it off? How long does it go on for? Is there a time limit?