
Brian Marshall sent me this and I find it really interesting. It was sent to him by a European goldsmith and pertains to professionals, not hobbyists.
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Beginner takes from 2 to 4 years (a few stay here forever)
Novice - making the more "complex" mistakes in your work, because now you can (and think you know it all) - 4 to 10 years
Expert - at least 10-15 years+ (some never make it, even after 30 or 40 years!)
Over here (in the US) you are an "Expert" or "Professional" in less than 2 years...