8 Hour Timer

An 8 hour online countdown timer for a full workday, a complete sleep cycle, an intermittent-fasting window, or a long shift.

Countdown timer

Quick utility for focus sprints or breaks — runs in the browser.

Channels
Browser (off)
Remaining
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Eight hours is the unit of the working day, a recommended sleep cycle, and the most popular intermittent-fasting eating window (16:8). It is also the standard length of a flight from London to New York. Once a duration crosses the multi-hour line, a server-scheduled timer becomes essential — relying on a tab to stay open, a phone to stay unlocked, or a watch to stay synced is asking for failure. This page sets an 8-hour timer that runs on the server, so the countdown survives device restarts, tab closes, and screen locks. Press start, label the block ("workday", "sleep", "eating window", "shift"), pick a notification channel — Telegram, browser push, or email — and the alert arrives at exactly the right moment. For an intermittent-fasting routine, save the timer as a daily reminder so the eating window opens automatically at the same time every day. For shorter durations, the 3-hour and 1-hour timers cover most workday subdivisions; for the next step up, the 12-hour timer is a follow-up.

FAQ

Is the 8-hour timer good for intermittent fasting?
Yes. The 16:8 method has an 8-hour eating window. Set the timer when the eating window opens, label "eating window", and the notification arrives when the fasting window starts again.
Will the 8-hour timer survive a restart of my browser?
Yes. The countdown is scheduled server-side, so it is not tied to a browser session, tab, or device.
Can I use it as a sleep timer?
Yes — start it before bed, label "sleep", and the wake-up notification arrives 8 hours later via the channel you chose.
Can I make 8 hours recurring?
Yes. After one run, save it as a daily reminder so the timer is queued automatically every day at the same time.

Related timers

← RemindMeNow