Deep Work Timer
A 90-minute timer designed for deep work — the kind of focused, cognitively demanding work that produces your most valuable output. Pick an ambient theme, eliminate distractions, and give your brain the uninterrupted time it needs to do its best thinking.
How to Use the Deep Work Timer
- Prepare your environment — close unnecessary tabs, silence notifications, put your phone in another room. Deep work requires zero interruptions
- Choose your theme — click the gear icon to select from 8 ambient backgrounds. Pick something that calms without distracting
- Set your duration — defaults to 90 minutes. Click the clock icon to adjust, or use presets like 60 or 90 minutes
- Start and commit — press start or hit spacebar. The first 10-15 minutes may feel restless. Push through — deep focus comes after the friction fades
Why 90 Minutes?
Your brain operates in ultradian rhythms — roughly 90-minute cycles of higher and lower alertness that run throughout the day. Working in 90-minute blocks aligns your focus sessions with this natural cycle, letting you ride a full wave of peak cognitive performance before your brain naturally needs rest.
Cal Newport, who coined the term "deep work," argues that this kind of extended, distraction-free concentration is becoming both increasingly rare and increasingly valuable. In a world full of Slack pings and open-plan offices, the ability to focus deeply for 90 minutes is a genuine competitive advantage.
Preparing for a Deep Work Session
Deep work doesn't happen by accident. The quality of your session depends heavily on what you do before you press start.
- Define your target — know exactly what you'll work on before the timer starts. "Work on the project" is too vague. "Write the introduction and first two sections of the proposal" gives your brain a clear goal.
- Eliminate escape routes — close email, close social media, close chat apps. Every open tab is a temptation. If you need the internet for research, use a site blocker for everything else.
- Gather materials first — have everything you need at hand before starting. Getting up to find a reference book or search for a file mid-session breaks your flow state.
- Protect the block — tell people you're unavailable. A single interruption can cost 20+ minutes of refocusing time, which devastates a 90-minute session.
After your session, take a genuine 20-30 minute break. Walk, stretch, eat something. Your brain continues processing in the background, and you'll often find that insights arrive during rest rather than during the work itself.
Frequently Asked Questions
What is deep work?
Deep work is a term coined by Cal Newport to describe professional activities performed in a state of distraction-free concentration that push your cognitive abilities to their limit. Unlike shallow work — email, meetings, routine admin — deep work creates new value, improves your skills, and is hard to replicate. Examples include writing, coding, designing, researching, and strategic thinking.
How long should a deep work session be?
Most research points to 90 minutes as the ideal deep work block. This aligns with your ultradian rhythm — the natural 90-minute cycles your brain moves through during the day. Beginners to deep work may need to start with 60 minutes and build up. Most people can sustain 2-4 deep work sessions per day, with breaks in between. Pushing beyond 4 hours of deep work in a single day typically yields diminishing returns.
How do I get into deep work?
Preparation is everything. Before starting your timer: close all unnecessary tabs and apps, put your phone in another room, tell colleagues you're unavailable, and have water at your desk. Many people use a "shutdown ritual" — a specific sequence of actions that signals to your brain it's time to focus. The first 10-15 minutes will feel restless. That's normal. Resist the urge to check anything. Once you push past that friction, deep focus follows.