90 Minute Timer

What fits in 90 minutes?

Ninety minutes is often used as a long deep-work or ultradian block, but it is a planning convention rather than a biological rule that fits everyone.

Long focus blocks are not automatically better. Use this duration when the task has enough depth to justify it, and shorten future sessions if attention or accuracy falls well before the alarm. Orbital Focus maps this duration to Deep Space. Prepare water, remove notifications, and choose one project with enough depth to justify the full mission.

Run the block with one clear target

Write the target before pressing Start. Keep only the material for that target visible, then let the countdown answer the question of when to stop. Press Space to start or pause, R to reset, and F to enter full screen. The progress ring and tab title keep the remaining time visible without adding another account, notification feed, or tracker.

Orbital Focus calls its 90-minute mission Deep Space, the longest destination in the app. Read about the Deep Space destination, or use the browser timer here when a simple countdown is enough.

When the timer ends

At zero, stop for a meaningful break. Note your energy and output so future sessions use a duration that fits you, not a claim on a productivity chart. Take a moment to record what changed during the block. A file saved, a page reviewed, or a question clarified is a better measure than whether every planned task disappeared.

The countdown uses elapsed clock time rather than assuming every browser update arrives on schedule. If the tab is slowed in the background, the display catches up from the real deadline when it runs again. Keep the tab open if you need the alarm, and check your device volume before a long session.