I'd say "I'll squeeze out some time to read books".
Just so you'll understand the metaphor, the thing that's getting squeezed is not the time during which you read books. It's the time that you've allocated to your other projects that will get squeezed. You're going to allocate less time to those other projects in order to make room for books. In other words, you're squeezing time "out" of the other projects.