Tip 33: Don't make your presentation too long
Most people's maximum attention span is approximately 30-45 minutes. If you exceed this limit, you’ll lose your audience at the crucial point, namely your conclusion!
Audience attention is greatest at the opening and then again when you say something like "In conclusion...." So, if you have 30 minutes for your talk, finish in 25 minutes. It is better to have your audience wanting more of you than to feel that they have had more than enough.
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