A book a week is easy if you don't have anything else to do. I used to read a book every 2-3 days when I was in highschool. Now with kids and family and my company going nuts I'm lucky if I can get 10 pages in per night.
Some nights we decide to use our "couples time" for reading, and that's nice but also doesn't happen too often because we do actually need some time to talk to each other as well. :)
I do agree that prioritizing time to read is important but at different points in ones life the amount of time/energy available can fluctuate greatly.