How do you work reading into the GTD system? If a book is good, I have no problem devouring it. But what about those second-tier books which are worth finishing, but tend to get pushed aside by other NAs? It doesn't really fit in as a next action if you define that action as "Read for X hours" or "Read XXX pages", probably because the best NAs are short and granular. I don't really like scheduling books either as it feels unnatural and to me doesn't really fit with the spirit of GTD. How do other GTDers handle "perpetual" tasks such as reading?