the WSJ has article on the benefits of spending 30 minutes regularly reading without interruption.
Read Slowly to Benefit Your Brain and Cut Stress
At Least 30 Minutes of Uninterrupted Reading With a Book or E-Book Helps
Slow readers list numerous benefits to a regular reading habit, saying it improves their ability to concentrate, reduces stress levels and deepens their ability to think, listen and empathize. The movement echoes a resurgence in other old-fashioned, time-consuming pursuits that offset the ever-faster pace of life, such as cooking the "slow-food" way or knitting by hand.
I started the habit of reading 30 minutes a day or more by reading on my kindle paperwhite when at the gym last year. For a while there I took no smartphone, but my spouse complained when I was not responding to text messages. Uhh, that is the point. :-) I had been using my Galaxy Note for a while to read, but found it way to distracting to check e-mail, surf the internet or read other things. The kindle paperwhite is a reading device only.
It feels good to spend at least 30 minutes aerobic work out and 30 minutes reading. For a while there I was up to an hour at a time, but I need have lax and fallen off in being a regular to the gym during the summer. Kids are back in school , so drop them off at the bus stop, then to the gym.