Deep Focus
45/15 Timer
Longer work blocks with adequate rest. 45 minutes of focused concentration followed by 15-minute breaks—ideal for tasks that need warm-up time before deep flow.
Settings
Settings are saved automatically to this browser.
Session Log
Data stored locally and reset daily.
When to use 45/15
The 45/15 method strikes a balance between very short intervals like 25/5 and longer blocks like 50/10. It suits work with a real warm-up cost: essays and reports need time to build voice and continuity, code requires loading a feature's full scope into working memory, and problem sets benefit from sustained exploration of multiple approaches. If you spend the first 15 minutes of a work block just orienting yourself, 45 minutes gives you genuine time to think before fatigue sets in.
The 15-minute break is a genuine pause—long enough to rest your eyes, stretch, hydrate, and let your mind reset without losing the thread of what you were working on. Unlike a 5-minute break that feels rushed, 15 minutes gives you breathing room.
If 45 minutes feels too long, return to 25/5 for shorter tasks or building momentum. If you want even more sustained focus, try the 50/10 method or the 90-minute focus timer. The best interval is the one you can sustain without burning out.
Cycles per 3-hour and 4-hour block
| Session length | Complete cycles | Total time |
|---|---|---|
| 3 hours | 3 | 3h 0m (3 × 60m cycles) |
| 4 hours | 4 | 4h 0m (4 × 60m cycles) |
Each complete cycle is 45 minutes of focus plus 15 minutes of short break (60 minutes total). A long break is taken after every three focus blocks.
A 3-block session
| Block | Duration | Mode |
|---|---|---|
| 1 | 45 min | Focus |
| 15 min | Short break | |
| 2 | 45 min | Focus |
| 15 min | Short break | |
| 3 | 45 min | Focus |
| 30 min | Long break | |
| Total | 3h 15m | |
Three 45-minute focus blocks with 15-minute breaks between, ending in a 30-minute long break. Adjust Settings to match your preferred session length and break rhythm.
45/15 vs 50/10 vs 25/5
The 25/5 method works well for shorter tasks and building early momentum, but may feel too fragmented for deep work. The 50/10 method extends the focus window for extreme context-switching costs, but demands more stamina. The 45/15 method is a middle path: longer than 25/5 to allow genuine flow, yet less demanding than 50/10. Pick the rhythm that matches your task and your energy that day.
Getting started
- Choose a well-scoped task. Identify one section or feature you want to complete—a page of an essay, a coding module, a problem set section. Know the natural end point.
- Prepare your environment. Close email, mute Slack, silence your phone. Forty-five uninterrupted minutes is more productive than 90 minutes with context-switching.
- Start the timer and ease in. The first 10–15 minutes are warm-up. Let yourself get into the task without pushing hard at first. By minute 20, you should be in flow.
- Use the 15-minute break fully. Move your body, drink water, look away from the screen. Do not start another task or check messages. A real break is what makes 45-minute blocks sustainable.
- Adjust as needed. If 45 minutes consistently feels too long, lower it to 40. If you find you are in deep flow at 45 minutes, bump it to 50. The timer serves you, not the reverse.
When 45/15 does not work
Lab experiments, live collaboration, and real-time debugging do not respect a timer. Some days your energy is low and 45 minutes feels impossible. On those days, drop to 25-minute intervals, or work by the clock without a timer and let momentum guide you.
The timer is a tool. Use it when it serves your work; set it aside without guilt when it does not.
Custom timer lengths
This timer is preset to 45/15/30, but you have full control in Settings. If you want to experiment—try 40/12 for a faster rhythm, or 50/20 for deeper work—the timer will remember your choices. For complete flexibility with any work-to-break ratio, visit the custom timer builder.
About the Pomodoro Technique
The Pomodoro Technique was developed by Francesco Cirillo in the late 1980s. It uses 25-minute work intervals with 5-minute breaks, and a longer 15–30 minute break after four complete cycles. "Pomodoro" and "Pomodoro Technique" are registered trademarks of Francesco Cirillo. This 45/15 timer is an independent adaptation that respects the spirit of time-boxing without any affiliation or endorsement. The original method is documented at the official Pomodoro Technique website.