Cut yourself off.

In the history of the entire world, I don't think anyone has ever said, "I wish that speech had been longer." So keep track of time, and by all means don't ramble. If you've run out of time to make a major point, either work it into the questions people have for you afterward, or send a follow-up note to the members of the audience.
Key: Take the length of time you've been asked to speak for, and cut it down by 20 percent.

Use milestones

For a five minute speech, you want to organize in roughly one-minute intervals, and you want to offer milestones to the audience at the top of each minute. You get one minute for your introduction, during which you explain what you plan to say. Then you get 60 seconds each for your three main points. That last 60 seconds can be used either for a short conclusion, or as a buffer in case you run long.
Key: Use verbal cues to keep the audience on track. Phrases that seem obvious on the written page can be much more helpful in oral remarks: "That was the first point. Now we'll talk about the second of my three points."

Source: Inc.

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