I do not feel honor bound to finish a book just because I started it, and I only read as far as I want to, whether that's 25, 50, or a hundred pages. I will give up on a book ten pages from the end if I really can't bear to continue. Life is short and my reading list is long.
This is my take too. I think I was in my 30s when I finally realized, "Hey! I don't have to finish this book!" and tossed one aside.
Now I stop when I lose interest. Or if I'm somewhat interested, I might skim a lot. Skip a few pages and catch up with the plot. Skip some more.
And a couple of nights ago, I walked out of a movie at a theater, after about 20 minutes. We'd driven about 25 minutes to get to the place, which was showing a film we'd missed seeing close by. My husband wanted to see it, I was indifferent. "Jupiter Ascending," if you're wondering.
When we pulled into the parking lot I noticed a Barnes & Noble across the way. Went to the movie, I was bored quickly, and then whispered to my husband that I was going to leave and go to the B&N. He wasn't surprised.
The movie was just $3.50 (second-run theater) so I didn't feel bad about abandoning it.
And spent the next 2 hours at the bookstore. Big improvement!
My husband said even he, who likes a lot of special effects, said the movie wasn't very good.
Yeah, life is too short to read books I'm not interested in and to watch movies that are meh.