Years ago, I recall reading that the optimal length of a presentation is twenty minutes. Any longer and the audience starts to tune out. If you have more information to cover, after twenty minutes or so, do something different.
Change the subject. Change the speaker. Tell a story. Survey the audience. Do a demo. Stop using slides or start using them.
Do something different to keep viewers or listeners paying attention instead of checking their phones or thinking about the rest of their day.
But that was then. This is now.
I just read an article that says (according to science) our brains get bored after ten minutes (not twenty). It noted that in view of this, at Apple product launch events they change the speaker every ten minutes.
If you do live presentations, videos, or podcasts, you might want to keep this in mind.
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