The Do's and Don't's of Agreeable Conversation : Page 185
will nevertheless soon be bored, and even resentful, if he does not soon manage to toss the ball into someone else's ready lap.
This is another way of saying that no one under any circumstances, unless he is perhaps an honored guest expected to give a sort of informal discourse, should talk long. I would say that you should make two minutes at a time your outer limit, unless specifically requested to tell a rather lengthy incident. Except in the latter circumstance, you should always talk in such a way as to give openings to others. Even in relating a lengthy request episode, you should manage enough of a pause from time to time for another to take up the thread of discourse. You might say, "I guess the same thing has happened to some of you" or "I wonder if any of you happen to know about this" or "Have any of you heard anything to support or deny this?"