Many people believe that a busy calendar means they are successful. The more meetings, the more important they feel. But Meta CEO Mark Zuckerberg thinks differently. Instead of filling up every single hour, he keeps some space free in his schedule. This practice, often called the “80% rule,” helps him focus on meaningful projects, stay flexible, and avoid burnout.
It’s a reminder that real productivity doesn’t come from being busy all the time, but from giving yourself room to think and act.
What Exactly Is the 80% Rule?
In a chat with John Collison of Stripe, Zuckerberg explained that he avoids back-to-back meetings, especially one-on-ones. Packing every hour, he said, can feel draining and takes away from high-value work. Without gaps in the day, there’s little space for emergencies, creative ideas, or problem-solving.
Even research supports Zuckerberg’s claim. Studies show that overfilled schedules can cause stress, fatigue, and lower overall performance. The 80% rule solves this by asking people to schedule only about 80% of their time and leave 20% free.
Companies like Google even recommend this to employees so they can stay adaptable.
Why Leaders Swear by Free Time
Experts such as Laura Mae Martin, Google’s productivity coach, say this free space makes people more flexible and effective. Authors like Tom DeMarco (Slack) and Oliver Burkeman (Four Thousand Weeks) also warn that without extra time, creativity suffers.
History shows the same pattern: Steve Jobs and Albert Einstein both carved out time to simply think, reflect, and explore.
Leaving part of your calendar blank gives you energy, room to innovate, and space to handle the unexpected.
If leaders like Zuckerberg protect their time by following the 80% rule, it’s a clear signal for others, too.
Instead of chasing a “full calendar,” try leaving space. You might find more focus, creativity, and joy in your work.
