knew a costa rican immigrant who didn't speak a word of english when he started at master woodcraft... (I don't work there anymore, and Cabinet Worksgroup 'retired' the brand and laid me off, no special consideration at this point).

six months later, he was training me on the CNC router, and spoke english with a mildly heavy accent, but was completely understandable.

Point is if this kid fresh off the boat can do it in six months, there's no reason you can't do it in two years, unless you have extra chomosomes or something...