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· just now. Report Abuse. The average attention span of a person is 2-5 minutes times their age, so a 5-year-old would have an average attention span of 15-25 minutes. Elementary education often seeks to extend or develop attention span in children.eport Abuse. The average attention span of a person is 2-5 minutes times their age, so a 5-year-old would have an average attention span of 15-25 minutes.