集中タイマー
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Planifai をダウンロード——無料45-Minute Focus Timer
時間制限付き集中セッションを使う理由は？
The natural attention cycle
Ultradian rhythms — the body's 90-minute biological cycles — peak in the first 45 minutes and then begin to decline. Stopping at 45 minutes and taking a break aligns your work with your body's natural alertness patterns, not against them.
The classroom session standard
Educational research has long settled on 45-50 minutes as the optimal lecture or class period length. Students maintain concentration and engagement best within this window before attention fragments significantly.
Deep work without over-committing
For professionals building a deep work practice, 45 minutes is an achievable entry point before attempting 90-minute or 2-hour sessions. It is long enough to reach genuine depth in a problem but not so long that it feels daunting to schedule.
このタイマーを使う場面
Forty-five minute timers are popular for yoga and Pilates classes, extended study blocks with active recall, coding sessions, extended writing periods, and workplace focus blocks scheduled before a natural transition point (lunch, a meeting, end of day).
よくある質問
Why is 45 minutes a common class period length?+
Educational psychologists have found that attention, note quality, and comprehension all degrade significantly after 45-50 minutes of passive instruction. The 45-minute class period was established to match students' natural attention capacity.
What are ultradian rhythms and how do they affect focus?+
Ultradian rhythms are 90-minute biological cycles that govern alertness, energy, and cognitive performance. The first 45 minutes of each cycle tend to be high-alertness; the last 45 minutes lower-alertness. Aligning work and rest with these cycles — roughly 45 on, 15 off — can boost sustained performance.
Is 45 minutes too long for a Pomodoro?+
The standard Pomodoro is 25 minutes, but the 50/10 variant (50 minutes work, 10 minutes rest) is popular among experienced practitioners. A 45-minute interval sits between the two and works well if you find 25 minutes feels too short once you are in deep focus.
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