I would say that between 10 and "several hundreds" hours the difference is so big to make a "100 hours" rule kind of pointless. If the bottom line is that the

I would say that between 10 and "several hundreds" hours the difference is so big to make a "100 hours" rule kind of pointless. If the bottom line is that the more you practice the better you get (or rephrasing it, if you practice a relatively small amount of hours you will be more competent than an absolute beginner), well, breaking news from the Department of the Bleeding Obvious.