25 Minute Timer

Francesco Cirillo chose 25 minutes in the late 1980s after experimenting with different intervals. The length is short enough to resist distraction ('I can do anything for 25 minutes') yet long enough to make meaningful progress on complex tasks. Neuroscience research on working memory and sustained attention supports 20–30 minute focused blocks as optimal for most cognitive tasks before the prefrontal cortex needs a brief recovery period.

Yes — the 25-minute timer is one of the most evidence-backed study intervals. Learning researchers recommend 25–30 minute active study sessions followed by a 5-minute break for consolidation. During the break, avoid screens: stand up, get water, or do light stretching. This pattern boosts retention compared to marathon study sessions by leveraging spaced repetition and avoiding mental fatigue.

Step away from the screen entirely. Physical options: 20 jumping jacks, a quick walk around the room, or stretching. Mental options: close your eyes and breathe deeply, look out a window. Avoid checking social media — it re-engages your default mode network and undermines the benefit of the break. After four 25-minute Pomodoros, take a longer 15–30 minute break.

Yes. The JavaScript countdown continues running in the background. The browser tab title updates every second to show remaining time, so you can monitor progress without switching back. The audio alarm fires as soon as time expires, regardless of which tab is active.

Most people can sustain 8–12 Pomodoros per day (3.5–5 hours of focused work). Cal Newport's research on deep work suggests 4 hours of daily focused output is the practical ceiling for knowledge workers before cognitive quality declines. Start with 4–6 sessions if you're new to time-boxing, and increase gradually as your focus capacity builds.