In the glass blowing world, a master glass blower is a glass maker who can be givin a sketch or a verbal request and he can whip it out on the first try- any shape, any height. I'm proud to say that I am a master glass blower- 16 years in the trenches ....
my take on what makes a plug builder a master plug builder is anyone who can make not only any plug, Pikeis, dannies, needles, etc but be able to design and fabricate a unique plug to them..and have it swim right, and of course, have it catch-
Its not a time thing, its not how many you sell, its a talent thing, some catch on faster than others.
Christian's a master and hes only 17 (that will cost you a plug Christian

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