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.
Some psychologists claim the typical student s attention span is about 10 to 15 minutes long, yet most university classes last 50 to 90 minutes. Studentsâ attention levels vary widely based on factors like motivation, emotion, enjoyment, and time of day.espite the popular belief that students have âshortâ attention spans ranging from 10 to 15 minutes, there is considerable evidence to suggest otherwise. In a 2007 literature review, psychologists Karen Wilson and James H. Korn concluded there is little evidence to support this belief.