I would say that between 10 and &quot;several hundreds&quot; hours the difference is so big to make a &quot;100 hours&quot; rule kind of pointless.<p>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.