A Trader Journal

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Expertise development - 10000 hours - Poor criteria?

It is generally considered as standard that roughly it takes 10000 hours to develop expertise in any field. May be it is. I have some doubts/questions on the usefulness of this 10000 hour rule though like:
  • Do we learn by number of hours spent or is it by number of decisions we make and reflect?
  • Given large part of trading is making quality decisions, between these two cases who would have likely developed better trading expertise - A trader who spends 10000 hours (learning, analyzing etc..) but made only 1000 trades (decisions) or a trader who spent 8000 hours but made 5000 trades (decisions)?
  • If it is latter, i.e., number of decisions (made and reflected) is better criteria for trader expertise then shouldn't the rule be in terms of number of decisions (and not in hours)?
  • Would the same apply for other performance activities like music/sports etc?
I don't have expertise in Psychology/learning field to figure good answers to above questions. Hence the dilemma. Please let me know your thoughts on above questions.

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