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.
No âaverageâ attention span. There is simply no number that can be put on an attention span. Consequently, there can be no average. Some of us can focus on a three-hour concert, but fifteen minutes spent doing our taxes will leave us bored and begging for mercy. For others, the opposite is true.