Boss: Studies show that it takes 10,000 hours of focused practice to become an expert at anything. According to your resume, you’ve only had enough database experience to be an incompetent menace. Interviewee: How many hours have you practiced doing interviews? Boss: I don’t like where this is headed.
Source: Dilbert Comic Strip on 2012-11-03 | Dilbert by Scott Adams
The 10,000 hours concept was one of the most powerful observations I was told as a Peace Corps Volunteer. After training and the first year in community, the time as a volunteer was nearly 10,000 hours.