I have re-read a couple books in a series after a long hiatus before releasing the last or next book. My wife will re-read the entire series, for every release, it's one of her many quirks.
For me it takes something special like On the Road 50th anniversary edition in 2007. Funny, I liked it a lot more when I was in my 20's.
When my wife turned 42 I bought The Ultimate Hitchhikers Guide for her and read some of that content, but not all of it. I should crack that one open again. I tend to start talking and thinking in Douglas Adams cadence when I do, which annoys me at times, but it is a fun read.