John Adams. Maybe that should be "reading" because I finished the last third by getting the audiobook from the library.
I got the book as a gift for Christmas 2001, and I don't really know why it took so long to work through it. I would pick it up, read a bit, put it down, not get back to it for months. The story was interesting, but it's not like I was hanging on the edge of my seat wanting to know what happened next. I knew the arc of Adams' life, I was reading for details. And details just weren't enough motivation to keep me reading consistently, I guess. I found very quickly that it was not good bedtime reading, since I would barely get through a page or two and fall asleep, and it's a very heavy book to let fall (this does not imply it was boring - if I can fall asleep reading about a dragon crashing through Gringotts bank, I can fall asleep reading anything).
The book had languished on my TBR pile for about a year before I did the Great Book Purge and cleared away the "I'm really never going to read this" books. Those went into a giant "Donate" pile and John Adams went on the "Keeper" shelf as a "I will get back to it, but I don't want it staring me in the face every day" book. (guilt, guilt, guilt)
Then a couple months ago, I was wandering through the audiobook section in the public library. As soon as I saw John Adams, I snatched it up. I started from the beginning, and 26 discs and almost 2 months later, I FINALLY finished the book yesterday while I was cleaning the house for Easter dinner. It felt a little anti-climactic, but I can now move on to other books completely GUILT-FREE! Yay!
What about you? Have you ever had that one book that you couldn't get through, but also couldn't let go?