He's been in their lives for over 10 years. But it goes on, and it will evolve.â. Indeed, Grey's has persevered after the departures of several regular cast members, including Isaiah Washington, Sandra Oh, Katherine Heigl, T.R. Knight, Kate Walsh, Eric Dane, Chyler Leigh, and Kim Raver.
1 Some state that the average human attention span is approximately 5 minutes; others state that most healthy teenagers and adults are unable to sustain attention on one thing for more than about 20 minutes at a time, although they can choose repeatedly to re-focus on the same thing.
1 The average attention span of an adult is 20 minutes. 2  Implication: you should ensure that the first 20 minutes of your talk include any material that you want your audience to remember. The same is true of your talk. 2  Do not bury the main results in the middle of the talk. 3  Not only might the audience miss them but you might be past your audience's 20 minute attention span and they'll have already tuned you out.