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Yahoo CEO Marissa Mayer explains how she worked 130 hours a week and why it matters

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Marissa Mayer
Yahoo CEO Marissa Mayer  Justin Sullivan/Getty Images

Yahoo CEO Marissa Mayer is known for her strong work ethic.

She's regularly pulled off all-nighters during her time at Google, and even worked from her hospital bed shortly after having her twins last year. It's why former Yahoo director Max Levchin calls her "the hardest working CEO in Silicon Valley, bar none."

Mayer says hard work is an important part of any business and an often overlooked part of Google's success. She shared more details around her 130-hour workweeks and why it matters in an interview with Bloomberg:

"The other piece that gets overlooked in the Google story is the value of hard work. When reporters write about Google, they write about it as if it was inevitable. The actual experience was more like, 'Could you work 130 hours in a week?'

"The answer is yes, if you're strategic about when you sleep, when you shower, and how often you go to the bathroom. The nap rooms at Google were there because it was safer to stay in the office than walk to your car at 3 a.m. For my first five years, I did at least one all-nighter a week, except when I was on vacation — and the vacations were few and far between."

Mayer added that hard work is what separates startups that succeed and fail, and that she's able to tell which ones are more likely to succeed — without even knowing what they do — by simply looking at their work ethics.

"Being there on the weekend is a huge indicator of success, mostly because these companies just don't happen. They happen because of really hard work," she told Bloomberg.

You can read the full Bloomberg interview here >>

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Eugene Kim
Eugene is Business Insider’s Chief Tech Correspondent, where he leads coverage of Amazon. His reporting spans the company’s retail and logistics operations to AWS, Alexa, and its internal culture.Previously, he worked at CNBC, Fortune Magazine Korea, and Japan's Yomiuri Shimbun. He holds degrees from NYU and Columbia University’s Graduate School of Journalism.In 2022, Eugene reported on internal documents indicating that Amazon allegedly used deceptive tactics to enroll customers in Prime and made cancellation difficult. The Federal Trade Commission sued Amazon the following year, citing his reporting. The case ended in a record $2.5 billion settlement in 2025.His work has received multiple honors, including the SF Press Club’s Bay Area Journalism Award and SPJ NorCal’s Excellence in Journalism Award.Eugene lives in the Bay Area. Contact him via email at ekim@bjinnox.com, or Signal, Telegram, or WhatsApp at 650-942-3061. Use a personal email address, a nonwork WiFi network, and a nonwork device; here's our guide to sharing information securely.