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Generally speaking, when it comes to skilled, WORLD CLASS performance (i.e. a martial art or being fluent in another language to the point that a native speaker can't recognize an accent)... its 10,000 hours of "deliberate practice". This means, focused, attentive repetition where there is both accurate feedback and a determination on the part of the learner to improve to perfection.
Most martial arts take around 600-800 hours to reach "black belt" level (using japanese/okiniawan karate as an example). Some take much longer such as jujitsu because you are severely limited in the number of repetitions to can repeat. For example, brazillian jujitsu might take 10 years to get a black belt... generally, as an example, where you can throw 2000 jabs in an hour, you can't train 2000 arm bars in an hour.
The worlds foremost authority on the acquisition of skill and expertise is K Anderes Ericsson and several of his books, i have right in front of me. His and motor learning books are critical tools to me in coaching fighters.
Generally, there is no such thing as a prodigy. All learning requires time and repetition with the exceptions of those who are autistic or otherwise impaired where some areas of the brain compensate for others which are deficient resulting in other interesting talents. For every 10 year old violin "prodigy", there are usually 2 obsessed parents who are music teachers forcing their kid to practice 6 hrs a day as they hover over them demanding perfection. We are always amazed at the end result, but never see the 1000s of hours of focused work.
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Yes, fewer illegal immigrants working equates to more job opportunities for American citizens.
Rochard
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