If you always have something to read on hand, you can fit in a few more pages during extra bits of time throughout your day. For me, that’s my commute (waiting for/riding the subway, walking to/from the subway and my office), my lunch break, waiting in lines, waiting for chronically late friends to arrive at restaurants, and before bed. For those who drive to work, you could listen to audiobooks.
I must acknowledge that this strategy might mean forsaking some water cooler banter. For example, some of my coworkers eat lunch together most days and I usually eat at my desk while reading. For people who recharge and feel invigorated by social interaction or who need to network at lunch, this may not be wise. My job involves so much interaction with other people that I prefer to disengage at lunch and retreat to my happy place.