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The 90-Minute Work Block: A Game-Changer for Productivity


time blocking, clock, time, 90 minutes


Imagine this: You sit down to work, determined to get things done. But within minutes, you’re checking emails, answering messages, and getting distracted by notifications. Sound familiar?


Now, imagine an alternative: You block out 90 uninterrupted minutes, dive deep into focused work, and accomplish more in that short time than you do in an entire scattered workday. That’s the power of the 90-minute work block.


This method isn’t just a productivity hack—it’s a science-backed approach to working with your brain’s natural focus cycles instead of against them.



Why 90 Minutes? The Science of Deep Work


Your brain isn’t designed to focus endlessly. Research shows that we naturally go through cycles of high focus and low energy, known as ultradian rhythms. These cycles last about 90 minutes, after which your brain needs a short break to recharge.


That’s why long, unstructured workdays lead to burnout and inefficiency. Instead, working in structured focus sprints allows you to fully engage in deep work without mental fatigue setting in too soon.



How to Implement the 90-Minute Work Block


  1. Pick Your Most Important Task – Choose one thing to focus on.

    No multitasking!

  2. Set a Timer for 40 Minutes – Work with complete focus, eliminating distractions.

  3. Take a 10-Minute Break – Step away, stretch, grab water, or do something non-work-related to recharge.

  4. Start Another 40-Minute Work Block – Get back into deep focus for the final stretch.

  5. Take a Longer Break (15–20 Minutes) – Reward yourself with rest before starting another cycle.



Why This Works for Entrepreneurs & Virtual Assistants


  • Better Focus: No more half-working, half-distracted busywork.

  • More Done in Less Time: Less context-switching = higher efficiency.

  • Prevents Burnout: Built-in breaks keep your brain fresh.

  • Helps with Client Work: Dedicate blocks to different clients/projects without overlap.



Try It & See the Difference


If you’re constantly feeling busy but not productive, this small shift can change everything. Try a 90-minute work block—and watch your focus and results skyrocket.


Need help structuring your workload for better productivity?

Book a discovery call with MZVA to optimize your business workflow.



productivity strategy, 90-minute work block, deep work, time management, entrepreneur efficiency


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© 2025 Melissa Zimmermann VA

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