University of Washington researcher, John Medina... once told me that no matter how engaging you are, your audience will begin to tune out of your conversation after about 10 minutes. That doesn’t mean you can’t reign them back in, but if you drone on and on you will most likely lose their attention.
Apple does a nice job of building in “soft breaks” to maintain the attention of the audience. [Tim] Cook didn’t speak for much more than ten minutes at a time. He would break up his slides with another speaker or a video. All the Apple speakers stuck to the rule. During his introduction of the new operating system, OS X Mavericks, Federighi included two demonstrations, both lasting under 10 minutes and both about 10 minutes apart. Although Federighi held the stage for more than 10 minutes, he provided soft breaks and kept the flow moving nicely: Slides-demo-slides-demo-slides.
“10 Presentation Techniques You Can (And Should) Copy From Apple's WWDC Keynote.” Forbes. 6/11/2013
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