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The power of staying focused

Gloria Mark, a professor of informatics at UC Irvine, has been measuring how long people maintain attention on a single screen for nearly two decades. When she started in 2004, the average was two and a half minutes. By 2012 it had dropped to 75 seconds. Her most recent measurements put it at 47 seconds. Not how long people can focus, to be clear, but how long they actually do focus before switching to something else. The capacity is still there. The environment has made it almost impossible to use.

And the costs go well beyond just getting less done. Mark found that people who switched tasks most frequently reported 45% higher stress and 38% more frustration than those who switched less. The relationship runs both ways too: fragmented attention causes stress, and stress fragments attention further, so you end up in a cycle that most of us are living in without quite realising how much it's taking from us.

What's happening when you focus

When you're properly focused, your prefrontal cortex is doing something quite demanding: it's actively filtering out everything that isn't the task at hand. Every notification you suppress, every conversation you tune out, every impulse to check your phone that you resist, all of that filtering takes cognitive resources. It's not that focus is passive and distractions are active. Both are active, and focus only wins when your filtering system has enough energy to maintain the boundary.

This is why focus gets harder as the day goes on. You've been filtering for hours, and the cumulative load builds up. The voltage model captures this well, even for people without ADHD: your capacity for the most demanding cognitive work is highest in the morning and drops from there. If you spend your mornings in meetings and email and save the hard thinking for the afternoon, you're trying to do the most demanding work with the least available capacity, which rarely goes well.

The real cost of switching

Mark's research on interruptions found something that should change how most people structure their days: it takes an average of 25 minutes to fully return to a task after an interruption. Not to start working again, that happens quickly, but to reach the same depth of engagement you had before the interruption. And we interrupt ourselves more than other people interrupt us. The phone buzzing is one thing. Reaching for the phone when it hasn't buzzed is more common and more damaging.

For routine work, the cost of switching is manageable. For anything complex, creative, or analytical, it's enormous, because the depth of thinking you need takes real time to build and is instantly destroyed by interruption. You can spend twenty minutes getting into a problem, be interrupted for thirty seconds, and then need another twenty minutes to get back to where you were. That's not an interruption; it's a reset.

The practical upshot is that protecting uninterrupted time matters more than almost any productivity technique you can apply within fragmented time. A Pomodoro timer helps, but only if the 25 minutes are actually uninterrupted. Two interruptions during a Pomodoro means you never reached depth at all. The timer works best when you've also silenced notifications, put the phone in another room, and batched your communications into specific windows rather than letting them trickle through all day.

Flow and why it needs empty space

The deepest form of focus is what Csikszentmihalyi called "flow": total absorption in a task where self-consciousness drops away and time distorts (you look up and three hours have passed). Neuroscience research suggests that flow involves a temporary quieting of the prefrontal cortex, which is the part of your brain normally busy with self-monitoring, worry, and keeping track of everything you haven't done.

Which connects to something interesting. Every uncaptured commitment, every unanswered message, every vague obligation floating around in your head is a background process that prevents the prefrontal cortex from quieting down. The open loops concept isn't just about organisation. It's about creating the mental preconditions for flow. Getting things out of your head and into a trusted system clears the runway for the kind of sustained attention that produces your best work.

Flow also needs time. Most people need at least 15 to 20 uninterrupted minutes before flow can even begin. If you never protect a block of 30 minutes or more for a single task, you may never experience flow at all, no matter how well-organised your task list is.

Focus is creativity's friend, not its enemy

There's this common idea that creativity needs a wandering mind and that focus is somehow the opposite of creative thinking. The research points the other direction. A 2023 study found that uninterrupted focus of at least 25 minutes was necessary for what researchers call "incubation," the unconscious processing that produces creative breakthroughs.

Your mind does wander during focused work, but the wandering happens within the problem space. You're making connections between ideas related to the thing you're working on, which is completely different from the kind of wandering that happens when you're distracted. The person who bounces between twelve browser tabs isn't being creative. They're being pulled.

I think the "creative person who needs chaos" is usually someone who hasn't experienced what happens when they protect an hour of real quiet. The chaos isn't feeding the creativity. The creativity is surviving despite it.

What actually destroys focus

Your phone, even when it's silent. Research from Carnegie Mellon found that the mere physical presence of a smartphone, even face down, even off, reduces baseline cognitive capacity. The phone doesn't have to interrupt you to reduce your ability to focus. It just has to be there, reminding your brain that the entire internet is within arm's reach.

Mark's email experiment from 2012 is worth knowing about: she cut off email in an organisation for a full workweek and found that people focused for significantly longer periods and reported measurably lower stress. You probably can't cut email for a week, but you can check it at set times rather than continuously, and the difference is real.

You, interrupting yourself. This is the harder problem because there's no off switch. You're working on something difficult, it requires sustained effort, and part of your brain generates the urge to check something, look something up, quickly respond to that message. The interruption comes from inside.

The best defence is environmental. Remove the things that make self-interruption easy: close unnecessary tabs, use a distraction blocker if you need one, work in full-screen mode. Design your visual field so that the only thing available is the task. The second defence is capturing the interrupting thought without acting on it: write it down on a pad or in a quick note and go back to what you were doing. Your brain can let the thought go once it's captured, and you haven't broken your focus to act on it.

The multitasking problem. What most people call multitasking is rapid task-switching with the illusion of doing two things at once. Research from the University of Michigan found that students who multitasked during lectures retained 28% less information, and (this is the alarming part) they also reported feeling more confident in their understanding. The gap between perceived and actual learning is worse when you're multitasking, not better.

The fix is simple to say and difficult to do: one thing at a time. Time blocking helps because the decision about what to work on is made in advance, not in real time. The Ivy Lee Method helps because it limits your active list to six prioritised items. Both reduce the number of switching decisions you have to make throughout the day.

Stress. When you're stressed, your attentional system shifts into threat-monitoring mode and has a much harder time sustaining engagement with complex tasks. This is useful when there's an actual threat and counterproductive for everything else, which is most of your working day.

The most practical responses: a brief walk resets cortisol and restores attentional capacity. Sleep is non-negotiable because a tired brain is a distractible brain regardless of caffeine. And clearing your open loops, getting your commitments out of your head and into a system, reduces the background stress that competes with focus all day long.

Getting better at focusing

Focus improves with practice, but the practice is more about what you stop doing than what you start.

Protecting blocks of uninterrupted time is the most important thing. Start with 30 minutes of actually uninterrupted work and build from there. Your brain adapts to the expectation that this is a period where nothing interrupts, and over time the focus comes more easily.

Building a consistent routine helps because routine reduces the number of small decisions competing for your attention throughout the day. The weekly review does something similar at a larger scale: by regularly clearing and organising your commitments, you lower the background noise that fragments attention all week.

Resting properly matters more than most people think, and resting properly means not consuming more information. Scrolling your phone during a break is not rest for your attentional system. It's more of the same stimulation. Walking outside, sitting quietly, talking to someone in the room, that's actual recovery.

And tracking when you focus best is probably the single most valuable experiment you can run on yourself. Most people have a window of two to four hours per day where deep focus is reliably available. For most, it's the morning. Finding that window and defending it from meetings, email, and admin is worth more than any app or technique.

Why this matters more than any system

Here's what I keep coming back to. No productivity system will help you if your attention is constantly fragmented. GTD, PARA, Pomodoro, time blocking, all of these assume you have some capacity for sustained focus to bring to the work. If that capacity is being destroyed by your environment, fixing the environment matters more than choosing the right system.

The ability to pay attention to one thing for a sustained period is the foundation underneath every productivity method. Everything else is scaffolding around that foundation. If the scaffolding is elaborate but the foundation is cracked, nothing holds.

Mark's research gives us both the diagnosis and the direction. Our digital environments are systematically eroding our ability to sustain attention. We can design our environments, our tools, and our habits to protect it instead. Forty-seven seconds is where we are. It doesn't have to be where we stay.

Frequently asked questions

Is my attention span actually getting worse, or does it just feel that way? The data suggests it's real. Gloria Mark's longitudinal research shows average attention on screens dropping from 2.5 minutes in 2004 to 47 seconds in recent measurements. This is an environmental change, not a generational one: the same people focus for shorter periods as their digital environment becomes more demanding of their attention.

How long should I be able to focus at a stretch?

Most research suggests that 60 to 90 minutes of sustained deep focus is a reasonable upper limit before a real break is needed. Within that, the Pomodoro Technique's 25-minute blocks work well for most people. Rather than aiming for four hours of unbroken concentration, aim for several focused blocks with real rest between them.

Is listening to music while working helpful or harmful?

It depends on the work and the music. For routine tasks, familiar music without lyrics can improve mood and endurance. For complex cognitive work, silence or very low-volume ambient noise tends to produce better results. Music with lyrics competes for the same language-processing resources you need for reading, writing, or analysis. If music seems to help, it's usually because it blocks out worse distractions rather than because it enhances focus directly.

How do I focus when I work from home?

The principles are the same as anywhere: protect blocks of time, remove distractions from your workspace, communicate boundaries to anyone sharing the space. A dedicated workspace, even just a specific chair, helps create the association between place and focus that an office provides automatically. The challenge at home is usually that the things you're avoiding at work (dishes, laundry, random browsing) are more accessible than they are in an office.

Can meditation improve focus?

Research consistently shows that regular mindfulness practice improves sustained attention, and the effect builds over time. Even five minutes of focused breathing daily improves your ability to notice when your attention has wandered and bring it back, which is the core skill of maintaining focus. You don't need a retreat or an app. Just sitting quietly and paying attention to your breathing for five minutes is the whole exercise.

Does exercise help with focus?

Yes, and the effect is well-documented. Physical activity increases blood flow to the brain and releases chemicals that improve mood and cognitive clarity. Even a brief walk can restore attentional capacity when it's flagging. If you can only do one thing to improve your focus, a daily walk or short exercise session is probably the highest-return investment.