Mark Cuban gets up to 1,000 emails a day on three phones and answers every one of them himself. He refuses to hire help. He says he'd rather plow through them than sit in a single meeting. The math is on his side: a 30-minute meeting at Shopify costs the company up to $1,600.
Add an executive to the invite and the same meeting crosses $2,000. When Shopify audited its own calendars in 2023, it killed 12,000 recurring meetings and estimated 322,000 work hours saved that year. Across America, the Bureau of Labor Statistics estimates pointless meetings drain roughly $37 billion a year out of US businesses.
The brain science makes the bill worse. A study from Gloria Mark at UC Irvine measured how long it takes a person to fully refocus on real work after one interruption. The answer was 23 minutes and 15 seconds. Microsoft's 2025 Work Trend Index, built from anonymous data across millions of company accounts, found that office workers get pinged every two minutes during the workday. That works out to 275 interruptions a day. Bouncing between Slack, email, meetings, and the work you were actually hired to do can wipe out up to 40% of what you would have produced.
Jeff Bezos figured this out a decade ago. At Amazon, he banned PowerPoint and made executives sit in silence reading a six-page memo before anyone was allowed to speak in the meeting. Cuban arrived at the same answer without writing it down as a rule. Email lets him reply on his own schedule, not yours. The inbox is also searchable, which is why he still has folders going back to his 1980s CompuServe days, the dial-up online service from before the consumer internet existed.
Cuban sold his first company, MicroSolutions, to CompuServe for $6 million in 1990. Nine years later he sold Broadcast .com to Yahoo for $5.7 billion. Forbes now puts his net worth at roughly $6 billion, with a 27% slice of the Dallas Mavericks left over from his 2023 majority sale. He spends about two seconds per email deciding whether to reply or delete. Most meeting invites would not survive that two-second test. The habit that looks like a billionaire's quirk is the same logic Bezos already wrote into Amazon's policy.
Mark Cuban reveals why he carries multiple phones
“They’re on different networks. Certain apps run on Android or better on Android, that don’t run on the iPhone”
“I live my life on email. I don’t sit in front of a computer, I’m gone most of the day”
“I hate meetings. I don’t like giving them, I don’t like sitting in them”
“If you want a meeting with me, you better be doing something for me that makes it worth my while because otherwise, just send me an email”