The written word guidelines are great rules of thumb that can be adjusted based on experience with your audience, given the content is solid. I find, on the flip side, that for presentations the question of length varies dramatically based upon the tone, inflection, and body signals used by the presenter. TED talks has such fantastic presenters that I’m sure most of us would continue listening long after the 18 minute mark. For that platform, it’s more of a challenge to get a message across in 18 minutes, as opposed to the audiences attention span. Another great post, Kevan!
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