From the OWH Profile of Weschler and Combs

Investors earn handsome paychecks by handling Buffett's business,

"Read 500 pages like this every day," said Buffett, or words to that effect. "That's how knowledge works. It builds up, like compound interest. All of you can do it, but I guarantee not many of you will do it."

Remarkably, Combs began doing just that, keeping track of how many pages and what he read each day. Eventually finding and reading productive material became second nature, a habit. As he began his investing career, he would read even more, hitting 600, 750, even 1,000 pages a day.