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.
[â¦] The average attention span of an audience is 7 minutes. Thus, the audience â students and business people alike â will only pay attention to a topic for 7 minutes, after that a change should be made to maintain audience attention.f people have a short break, then they can start over with another 7- to 10-minute period, but 7 to 10 minutes is the longest block of time they will pay attention to any one presentation. WHY IGNITE! AND PECHA KUCHA ARE SO POPULAR.