Murphy has an excellent blog post up over on Banjo Hangout. It is titled "How to Practice: Play More Banjo." In all her years of writing she has never addressed this topic, and she really hit a nerve (to judge by all the positive comments). It's got great advice and I recommend giving it a read.
I have waited all my life to play the banjo. I have countless DVD’s and tapes with loads of books, until I found Murphy and Casey I was lost. Thanks to their methods of teaching my learning has taken a huge turn in improvement every day is like Christmas I get to play my banjo, thank you both.