A 30 minute timer is the classic focus block. It runs a few minutes longer than a Pomodoro interval and gives a task room to settle in, but not so much room that your attention fades before the end. That balance is why the main timer opens on 30.
Use it for writing, studying one topic, a focused coding session, or a meeting you want to keep on time. When the alarm rings, stand up for a few minutes before the next round.
