I used to measure a book by the distance between my bookmark and its last page. Now I remember books by the sentences that return to me, often long after I have put them down.
These days I keep a book within reach. A few pages in the morning, a paragraph before bed. When something stays with me, I stop for a while. Reading can be a quiet part of the day rather than another thing to finish.
If you are not sure where to begin, open the nearest book. One page is a perfectly good start.