PowerPoint tip 23.
Keep it short
Humans have short attention spans when it comes to passively
sitting and listening to a speaker. Audience attention is greatest at
the opening and then again when you say something like “In
conclusion….” This is just the human condition, especially so for
the busy (often tired) knowledge worker of today. So, if you have
30 minutes for your talk, finish in 25 minutes. It is better to have
the audience wanting more (of you) than to feel that they have had
more than enough. Professional entertainers know this very well.

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