I never read a whole book in one sitting, but I could read for hours. For me it wasn't the internet/phone distractions that broke me of that ability, it was having kids. There was just not time to do that anymore. Now, for better or worse, I still read a lot of books but in very small rapid chunks, even standing in line at the store. I treasure the times when I can go to bed and read for an hour or so, though I usually just fall asleep after 20 minutes.