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.
In the study, Not Quite the Average: An Empirical Study of Web Use, researchers determined that the average human span in 2013 was only 8 seconds (the average goldfish can pay attention for 9 seconds). As you can tell by the title of the study, researchers tested the human attention span specifically for web browsing.