13-Hour Beginner Fasting Timer

Last reviewed · Jun 29, 2026 · Not medical advice
Quick answer

A 13-hour fasting timer counts from your start time to your end time. If you start at 8:00 PM, a 13-hour fast ends at 9:00 AM the next day.

ELAPSED 10:47 83%
Fasting duration13 hours
Start time8:00 PM
End time9:00 AM next day
Best usebeginner fasting timer

This page gives a simple 13-hour timer example and explains when a fasting app is better than mental math or alarms.

How to set the timer

01 Pick 13 hours as the fasting duration.
02 Start the timer when your eating window closes, such as 8:00 PM.
03 Check progress instead of recalculating the end time.
04 End the fast when the timer completes, then review the completed fast in your history.

Why use this timer

Beginner-friendly tracking should make the routine less confusing, not add pressure.

Common mistakes

01 Using a generic alarm and forgetting what window it was for.
02 Restarting the timer after every small schedule change instead of saving a preset.
03 Making the first timer too intense if you are new to fasting.
04 Ignoring how the window fits sleep, work, training, and meals.

How Fast Goblin helps

Fast Goblin turns a 13-hour fast into a clear progress screen with start time, end time, reminders, and history, so the timer feels easy to repeat.

How Fast Goblin helps

Fast Goblin turns a 13-hour fast into a clear progress screen with start time, end time, reminders, and history, so the timer feels easy to repeat.

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Common questions

How long is a 13-hour fast?

It is exactly 13 hours from the moment you start the timer.

Can I start the timer at any time?

Yes. The duration matters more than the sample start time.

Is this medical advice?

No. This page is for tracking and planning only.

Safety note
Fast Goblin is a tracking app, not medical advice. Intermittent fasting is not for everyone; people who are under 18, pregnant or breastfeeding, have a history of eating disorders, or use insulin/diabetes medication should talk to a qualified professional before changing fasting routines.

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Free on the App Store

Run your 13-hour fasts on autopilot

Start the timer in one tap and let Fast Goblin handle the end time, progress ring, and history.