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.
Among the good news in the 54-page report is that our ability to multi-task has drastically improved in the information age, but unfortunately attention spans have fallen. In 2000 the average attention span was 12 seconds, but this has now fallen to just eight. The goldfish is believed to be able to maintain a solid nine.