Why PowerPoint Presentations Always Die After 10 Minutes And How To Rescue Them

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.