All in a day's work
Their styles are wildly different, but all three leaders have a black belt in productivity.

NEW YORK (FORTUNE) - To really get inside the way today's business leaders do their jobs, FORTUNE spent an entire day shadowing three top executives: the laid-back techie who runs online classified site Craigslist; the pioneering boss of ad sales at CBS; and the nonstop CEO of an NBA team. From coast to coast, sunrise to sunset, we logged every meeting, e-mail and coffee break. Right up to the final buzzer. See scenes from their day.

The anti-CEO

Jim Buckmaster

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CEO, Craigslist.org

Length of workday: 8 hours

Six years ago, Buckmaster posted his resume on Craigslist's San Francisco site. Founder Craig Newmark saw it and hired him. Now the 6-foot-7 Midwesterner, who is 43, heads the world's biggest online classifieds site, with an estimated $20 million in revenues last year.

"I'm very fortunate. Managing Craigslist is a job that's full of the unexpected, very colorful, and almost always fun." -- Jim Buckmaster

The ace of ad sales

Jo Ann Ross

President, CBS Ad Sales

Length of workday: 11 hours

The first woman ad-sales chief at a major network, Ross, 52, runs a 200-person Manhattan-based division while doing a ton of selling herself. Sales hit $4.6 billion last year, her fourth year on the job. She's so close to her staff, that they call her "Mama."

"I think people would agree that I'm a bit of a type A. You can't survive if you don't multi-task during the day." -- Jo Ann Ross

The overtime guy

Brett Yormark

CEO, Nets Basketball

Length of workday: 19 hours

The youngest CEO in the NBA, Yormark, 39, is arguably the hardest working too. He has signed 84 new corporate sponsors in just over a year on the job. The East Rutherford, N.J., team brought in an estimated $86 million last season.

"On weekends, I'm at work by 7 a.m. I just love what I do. If you want to get everything in, it takes time." -- Brett Yormark

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Most stock quote data provided by BATS. Market indices are shown in real time, except for the DJIA, which is delayed by two minutes. All times are ET. Disclaimer. Morningstar: © 2018 Morningstar, Inc. All Rights Reserved. Factset: FactSet Research Systems Inc. 2018. All rights reserved. Chicago Mercantile Association: Certain market data is the property of Chicago Mercantile Exchange Inc. and its licensors. All rights reserved. Dow Jones: The Dow Jones branded indices are proprietary to and are calculated, distributed and marketed by DJI Opco, a subsidiary of S&P Dow Jones Indices LLC and have been licensed for use to S&P Opco, LLC and CNN. Standard & Poor's and S&P are registered trademarks of Standard & Poor's Financial Services LLC and Dow Jones is a registered trademark of Dow Jones Trademark Holdings LLC. All content of the Dow Jones branded indices © S&P Dow Jones Indices LLC 2018 and/or its affiliates.