Most successful people credit reading, in some capacity, as a factor in their success.
A young Elon Musk read for 10 hours each day before growing up to become Tesla CEO. These days, former Microsoft CEO Bill Gates reads a new book every week.
Here's how some of their peers incorporate reading into their own lives.
The Berkshire Hathaway magnate reportedly spends five to six hours a day reading five different newspapers.
He also combs through 500 pages of financial documents and recommends prospective investors do the same.
"That's how knowledge works," he recently told an investment class at Columbia University. "It builds up, like compound interest. All of you can do it, but I guarantee not many of you will do it."
The former Microsoft CEO has attested to reading 50 books a year, or roughly one book a week.
Most of the books are non-fiction dealing with public health, disease, engineering, business, and science.
Every now and then he'll breeze through a novel (and sometimes in one sitting late into the night). But primarily the books serve Gates' interest in learning more about the world he inhabits.
In 2015, the Facebook CEO vowed to read one book every other week "with an emphasis on learning about different cultures, beliefs, histories and technologies," he wrote in a Facebook post.
"Books allow you to fully explore a topic and immerse yourself in a deeper way than most media today," he wrote. "I'm looking forward to shifting more of my media diet towards reading books."
Since 1996, the veteran talk-show host has been advising her viewers' reading habits with Oprah's Book Club. Winfrey has calledreading "her personal path to freedom."
"Books allowed me to see a world beyond the front porch of my grandmother's shotgun house," she said in her acceptance speech for the 2004 United Nations Humanitarian Awards, adding that books gave her "the power to see possibilities beyond what was allowed at the time."
Dallas Mavericks owner Mark Cuban is a vocal supporter of treating business like a sport, which means he looks for the competitive edge however he can.
Often, that means reading for three hours every day, just to learn more about the industries he works in. Cuban has said this worked wonders at the start of his career.
"Everything I read was public," he wrote in his blog's Success and Motivation Series. "Anyone could buy the same books and magazines. The same information was available to anyone who wanted it. Turns out most people didn't want it."
Rubenstein, billionaire cofounder of the private equity firm The Carlyle Group, reportedly reads up to eight newspapers a day and six books a week.
The philanthropist chalks up his extraordinary ability to a laserlike sense of focus.
"From early on, I've been pretty driven," he told The Baltimore Sun in 2010.
According to The New York Times, the Nike founder kept the library behind his executive office so sacred that anyone who entered had to remove their shoes and bow.
When asked by the Times in 2007 if he'd preserved the library after stepping down as CEO three years prior, Knight responded with incredulity.
"Of course the library still exists," he said. "I'm always learning."
AP Photo/Jack Plunkett
Long before he became the CEO of Tesla, and even before he cofounded PayPal, a young Elon Musk was reading science-fiction novels for up to 10 hours a day.
He also reportedly read through the entire Encyclopedia Britannica when he was 9 years old.
He still credits a love of books for his vast knowledge about rockets. When asked how he knew so much about them, he said "I read a lot of books."