How long does it take to become an expert? - 5 views
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Hatice Çilsalar on 21 Oct 15Guess how many hours is needed to become an expert on yoga, celebrity gossip, knitting, science fiction, astrology or etc.?
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Mine Önal on 25 Oct 15This link have helped me to make a comparison of how many hours will it take to become an expert in different fields.