I get lumped in with the "let it grow" bunch, but I can tell you that you're way ahead of where I was at three weeks, and your coverage kicks ass compared to mine.  As I sit here at 3.5 months stroking an acceptable full beard, I'm thinking "Why in the world would this guy stop now?".

I think the thing that makes me lose my patience is other guys losing their patience.  It takes some time, dude.  Relax.