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What the tracker actually does

The Extended Fasting Tracker runs sessions from 24 up to 168 hours (one to seven days). Quick-select presets are 48h, 60h, and 72h; the slider covers everything in between and beyond in hour increments. If you're already fasting when you open the app, Start in Past lets you backdate the start by up to the fast length minus one hour, so the timer matches real elapsed time.

You can only run one fast at a time — the Extended Fasting Tracker and the Intermittent Fasting Tracker are mutually exclusive. Starting an extended fast takes over the timer until you end or cancel it.

What you see during a session

A large count-up timer and your target duration. Through the first 72 hours, the screen also surfaces content from our fasting library: a short stage description, body-state notes, and educational milestone callouts for common fasting phases such as ketosis and autophagy. These are orientation markers, not live biomarker readings. Beyond 72 hours, the timer and milestone state keep running; the hour-by-hour detail stops.

History, not resume

Completed, cancelled, and ended-early extended fasts are all saved to your history with duration and date range. There is no mid-fast resume — if a session ends, you start a new one. There is also no automatic daily restart: Extended is for deliberate one-off sessions, not a repeating loop.

How to use it

Decide the length before you start and stick to it, so you are not negotiating with yourself at hour 30. Treat milestone content as orientation, not prescription. Break the fast with a controlled first meal rather than a reward meal, and return to normal tracking the next day.