15 minutes at bedtime every night, plus any time I'm commuting. I think having an e-reader with back light helps, because you can read without disturbing anyone else in the bed and they are thin enough to carry anywhere.
This is my solution. 15-30 minutes before bed and maybe another 15-30 minutes in the morning on the weekends before the kids rush our bed around 7:45am. I'm using a Kindle Paperwhite.