I've become a big fan of binge-watching TV shows, but not for the reasons you might expect. I think of the time spent as if I'm taking a master class in story telling.
Consider this: fiction writers are advised to read widely within our chosen genre. This helps us learn pace and timing. When you hold a physical book, you know you're dealing with a finite amount of time in those characters' lives. You can internalize when the story picks up or lulls based on the pages turned. You know when you're halfway because your left hand works just as hard as your right.
The same goes for reading an ebook. The running percentage read at the bottom of the screen indicates how quickly you're reading or where you are in the grand total. Sure, back matter can throw you off--when a book ends at 92%, I often feel a little let down!--but you get the same general idea.