Can’t Get Anything Done? Try this 90-Minute Focus Rule

If you often reach the end of the day wondering, “What did I actually achieve?”, you’re not alone. Between juggling emails, Slack messages, countless browser tabs, and buzzing phone notifications, it’s easy to feel productive withoutbeing truly productive. The likely reason? Our brains simply aren’t built for multitasking.

Why Multitasking Doesn’t Work

Despite our constant attempts to do multiple things at once, science shows our brains can only focus on one task at a time. According to the NeuroLeadership Institute, every time we switch between tasks—like going from an email to a chat message to a spreadsheet—we experience what’s called a “switch cost” or “switch tax.” This is a delay that occurs when the brain stores information from the previous task and redirects its attention to the new one.

This constant switching doesn’t just make us less efficient; it can also take a toll on our health. Brown University Health reports that multitasking temporarily raises stress levels, blood pressure, and heart rate, leaving us more tired and distracted. Experts recommend minimizing multitasking wherever possible and working in focused, uninterrupted blocks instead.

The 90-Minute Rule: A Simple Fix for Scattered Focus

TikTok creator Olivia Yokubonis, the social media manager for the focus app Opal, recently introduced what she calls the 90-minute rule—a structured approach to deep work designed to help people finally complete their most important tasks.

Her advice? Take multitasking off the table. That means putting your phone away, setting clear priorities (“you can’t study four subjects at once”), and creating a space that supports focused work—no bed or sofa sessions allowed.

“This is not about willpower,” Yokubonis explains. “We are far past willpower. It’s about building an environment where distraction doesn’t even stand a chance.”

The idea is similar to the popular Pomodoro technique—which involves 25-minute focus sessions—but extends the period to about 90 minutes to align with how our brains naturally function.

The Science Behind 90-Minute Focus Cycles

Neuroscientists say the 90-minute rule aligns with the body’s ultradian rhythms—natural cycles of about 90 minutes during which our brains can maintain high focus before needing a rest.

According to Stanford neuroscientist Andrew Huberman, these “ultradian cycles” govern our ability to focus, learn, and think clearly. “If you’re going to do something hard,” he explains, “the 90-minute time block seems to be the one in which the brain can enter a state of focus … and then at about 90 minutes there’s a significant drop in your ability to engage.”

Similarly, neuroscientist Dr. Sydney Ceruto, founder of MindLAB Neuroscience, told Bustle that the brain “isn’t wired for eight-hour focus sprints” but instead for “90-minute cycles of high activation followed by 20-minute recovery.”

These findings echo earlier research on the Basic Rest-Activity Cycle, a 90-minute pattern that regulates both sleep and wakefulness.

How to Apply the 90-Minute Rule

Here’s a simple step-by-step guide to try it yourself:

1. Pick one priority task — something that truly requires your focus.
2. Eliminate distractions — put your phone on “Do Not Disturb,” close unnecessary tabs, and silence notifications.
3. Work for 90 minutes — ideally uninterrupted. The first few minutes are your warm-up; your deepest focus often comes around the halfway mark.
4. Take a 15–20-minute break — walk, stretch, or do something relaxing before your next session.
5. Repeat — if needed, schedule another 90-minute block later in the day.

Why It Works

• Respects your brain’s rhythm: You’re working with your natural cycles, not against them.
• Reduces switch costs: You avoid the productivity drain of jumping between tasks.
• Improves performance: Alternating between deep work and rest enhances focus and creativity.
• Feels more achievable: It’s easier to commit to one focused block than to expect yourself to be productive for eight straight hours.

Final Thoughts

If your days end with a sense of busyness but not accomplishment, the 90-minute rule might be the reset you need. You don’t need more hours in the day—you need structured hours. Try one or two focused 90-minute blocks tomorrow, take breaks in between, and see how much more you actually get done.