Why PowerPoint Presentations Always Die After 10 Minutes And How To Rescue Them — forbes.com

Your audience will mentally check out of your next PowerPoint presentation after about 10 minutes.  Given a presentation of moderately interesting content, your audiences’ attention will “plummet to near zero” after 9 minutes and 59 seconds, according biologist John Medina at the University of Washington School of Medicine. “Before the first quarter-hour is over in a typical presentation, people usually have checked out,” says Medina who cites peer-reviewed studies to reinforce this observation.

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