But unless you are an extremely gifted raconteur, people who talk for more than roughly half minute at a time are boring and often perceived as too chatty. So the light turns yellow for the next 20 seconds - now the risk is increasing that the other person is beginning to lose interest or think you’re long-winded. At the 40-second mark, your light is red. Yes, there’s an occasional time you want to run that red light and keep talking, but the vast majority of the time, you’d better stop or you’re in danger. Following the Traffic Light Rule is just the first step in keeping you from talking too much. It’s also important to determine your underlying motivation for talking 
so much. Is it that it just feels good to go on and
 on and get more stuff off your chest? Do you talk to clarify your thinking? Or do you talk because you often have to listen to other people, and when you’ve found someone who will let you have the microphone you just can’t help yourself? Get the full story at Harvard Business Review