A quarter hour. Long enough to make real progress.
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Fifteen minutes is where a session starts to feel like work instead of a warm-up. In a quarter hour you can write a page of notes, get through a short lesson, or work a handful of practice problems, and the finish line never feels far away.
It also fits the gaps in a day: the quarter hour before a meeting, after lunch, or while something is in the oven. Instead of losing those minutes to tabs and notifications, give them one task.
A quarter hour between calls is easy to waste. Pick one small item from your list before the gap starts, then press Start.
If fifteen feels short, run it twice with a short pause between. It's an easy way to build up to longer focus blocks.
On a computer, Start also opens a floating timer that stays above your other apps, so the time left is visible in any window.
For a focused review, yes. Pick one topic, close other tabs, and stop when the alarm rings. A few 15 minute rounds with short breaks can beat one long, distracted hour.
The top face. Pick 15 on the main timer and the cube rolls it to the front. On this page it's already selected, so you can press Start straight away.
Need a different length? Set a custom time on the main timer, or read how the timer works.
Each face of the cube suits a different kind of work.
Good for study and practice.