It's rude to waste time.
Bill has to give a speech to an audience of scientists on global warming that must last five minutes.
Bill wants to give a long enough speech.
Bill gives a compelling speech that gets right to the point.
Bill spends most of the five minutes of his speech talking slowly about irrelevant topics.
Bill is given a round of applause by the scientists.
Bill is booed by the scientists for trying to pad his speech time.