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How to do deep work in 25-minute blocks (and actually stay in them)

Starting a 25-minute work block is easy. Staying in it when your attention wanders is the part no one explains.

20 May 2026 · 4 min read

Why time blocks fail

Most people have tried some version of 25-minute work blocks — a timer app, a productivity method, a calendar slot marked "deep work." Most people have also abandoned it within a week.

The usual reason isn't that the technique doesn't work. It's that the setup was incomplete. A timer running in the background while the rest of the environment stays unchanged doesn't create a focus block — it just adds a countdown to normal distracted working.

For a time block to work, three things need to be in place before the timer starts: a single defined task, a running visible timer, and a cleared environment (no competing tabs, no notifications). The technique is the whole package, not just the timer.

The system

Step 1: Define one task before starting the timer

"Work on the report" is not a task definition — it's a project direction. A task for a 25-minute block should be specific enough that you know when you're done with it, or when 25 minutes of good work on it looks like.

Better: "Write the methodology section of the Q2 report" or "Fix the navigation bug in the mobile checkout flow" or "Draft the first three talking points for the Thursday presentation."

If you can't define the task in one sentence before starting, spend five minutes planning first. Starting the timer without a clear task means the first ten minutes will be used figuring out what to do, which wastes most of the block.

Step 2: Start the timer and clear the environment

Open Easy Todo Note in the side panel. Find the task you defined in the list, and start the per-task countdown timer — 25 minutes is the default deep work preset. The timer runs alongside your active tab without replacing it.

Before the timer starts, close or minimize everything that isn't needed for the task:

You're not blocking the internet. You're clearing the field of view so the path of least resistance is the task, not a distraction.

Step 3: When you drift, return — don't judge

Attention will wander. This is not failure — it's the nature of sustained attention. The skill of deep work isn't maintaining perfect concentration for 25 minutes; it's noticing when you've drifted and returning to the task.

The return should be immediate and neutral. You noticed you were thinking about something else. You return to the task. No self-recrimination, no analysis of why you drifted, no planning a better system — those are the most common ways to turn a ten-second drift into a five-minute detour.

Step 4: Capture interruptions without acting on them

Two types of things break a block: internal interruptions (a thought surfaces, something you need to remember) and external ones (a message arrives, a question occurs to you about another project).

For internal interruptions, keep a capture pad — the notepad section of Easy Todo Note works for this — and write the thought down without acting on it. The thought is preserved; your block is unbroken. You'll process it after the timer ends.

For external interruptions (a colleague needs something, a notification demands attention): unless it's a genuine emergency, defer it. "I'll respond in 20 minutes" is almost always acceptable and accurate. If it can't be deferred, end the block, handle the interruption, then start a fresh block.

Step 5: Take the break

When the timer ends, stop — even if you're mid-sentence and the work is going well. The break is part of the system, not an optional reward. It's what allows the next block to be good.

During the break: stand up, move, look away from the screen. Don't check email or social media — that's not a break, it's a context switch that will make the next block harder to enter.

Common mistakes

Using the timer without clearing the environment. A timer running in a tab behind Gmail and Twitter is a timer, not a focus block. The environmental setup is not optional.

Starting with an undefined task. "Work on project X" as a block definition guarantees the first few minutes will be low-quality. Define specifically before the timer starts.

Abandoning the technique after one bad block. A bad block — where attention wandered constantly, where the task was harder than expected, where an interruption broke the session — is normal. The technique works over many blocks, not every individual one.

Skipping breaks. Skipping the break to "keep the momentum" usually means the next block is worse. The rest is load-bearing.

FAQ

Why 25 minutes specifically?

The 25-minute interval is from the Pomodoro Technique (Francesco Cirillo, late 1980s), chosen to be long enough for meaningful work but short enough that the end always feels reachable. It's not magic — some people work better in 50-minute blocks, others in 15. The principle is more important than the exact duration — a defined, bounded work period with a clear task and a timer.

What counts as "deep work"?

Cal Newport's original definition is work that creates new value, improves skills, and is hard to replicate — writing, coding, designing, analysis, difficult communication. The practical definition for a 25-minute block is simpler — it's any task that requires sustained, undivided attention and would suffer in quality if done with half your mind elsewhere.

Do I have to turn off the internet?

Not necessarily. Some deep work requires internet access — research, writing with sources, reviewing documents in cloud tools. The goal is to close or minimize tabs and apps that aren't relevant to the current task, not to go offline. Social media, email, and news are what you're removing from the field of view, not the internet itself.

What do I do after the 25 minutes ends?

Take a short break — five minutes minimum. Stand up, get water, look away from the screen. The break is not optional; it's what makes the next block possible. After four blocks, take a longer break of 20–30 minutes before continuing.