That mean old clock on the wall doesn't tend to be particularly kind to leaders and entrepreneurs, so big surprise, companies that offer cliffs notes, abridged or otherwise easy-to-digest versions of books are soaring in popularity. These certainly aren't all bad, since they can help you quickly understand what the main point of a text is or let you jog your memory about it. They have their place.
But if you're going to read a book, please just read the real, whole book already, at least most of the time. There are valuable reasons not to skip even one word.
1. Reading is supposed to be enjoyable.
If you scan or take shortcuts, then you're not experiencing the book in the moment. You're focused more on getting done than being present enough to notice the weight of connotation or the artisanship of how a passage happens to be crafted. That can make it feel much more like just another chore than an enjoyable way to pass the time.
2. You'll have a better grasp of voice and pacing.
Good communicators develop their own sense of rhythm and sound in their writing. The more of the entire text you read, the more familiar and natural their voice will sound to you. Later, when you try to communicate to different audiences, you can adjust more easily, calling on all the techniques you've seen great writers put on the page. You'll also have a better sense of what people will tolerate well in terms of when to move your action or other message forward.
3. Your emotional response (and, therefore, memory) probably will be stronger.
As an example here, I'll offer Les Miserables by Victor Hugo. Each of the characters experiences incredible hardship. But particularly sorrowful is the story of Fantine, who is forced into prostitution to care for her daughter. Hugo could have quickly explained her fall from grace, but over dozens of pages, we walk with her as she slowly loses her lover, hair, teeth, job, dignity and hope. If we don't walk with her through the entire, slow, painful fall, we don't really see her. And if we don't see her, then a central idea of the book--that suffering can be excruciatingly unfair and continuous--isn't personal, and we're not empathetic.
4. You take more time to think.
Cliffs notes and other means of abridging texts usually encourage you to chew books up and spit them back out right away. You don't naturally take as many breaks. Subsequently, you don't get as many opportunities to reflect on what you just took in. Research suggests that this is one of the simplest ways to remember more of what you read, as it allows your brain to make more direct and abstract connections between the new information and what you already know.
5. You learn patience and time management.
Reading something like Les Miserables, Don Quixote or Clarissa goes blatantly against the fast-as-possible, right-now, quick-fix mentality that unfortunately is so pervasive in today's business culture. It teaches you how to stick with something, how to get invested and how to establish a good habit. If you can read through your books, suddenly those projects that extend for months, long seminars or training periods don't seem so ogre-ish.