As I age, I try to choose my fiction more carefully and savor every word. However, life's too short for bad novels, so I'll skip to the end to see if there's enough redeeming interest to bother with the middle.
For a mercenary, but effective approach to getting through the enormous amount of nonfiction reading expected of graduate students, see Paul Edwards's pdf "How To Read a Book" at this site:
http://pne.people.si.umich.edu/essays.html