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.
Quick Answer. According to Kids Growth, the attention span of a child or teen who is actively trying to pay attention is 3 to 5 minutes for every year of the child's age. As a result, a 13-year-old has an attention span between 39 and 65 minutes, while a 16-year-old is capable of paying attention for 48 to 80 minutes. Keep Learning.