20-Hour Widget Fasting Timer

A 20-hour fasting timer counts from your start time to your end time. If you start at 8:00 PM, a 20-hour fast ends at 4:00 PM the next day.

Start a 20-hour fast

GOAL

20h

20-Hour fast

What it does

Start at 8:00 PM; finish at 4:00 PM (next day).

Set up your 20-hour timer

01

Pick your goal

Choose 20 hours, or pick a preset like 16:8 and OMAD.

02

Tap start

The ring begins filling and shows exactly how long is left.

03

Add the widget

Keep the live timer on your home screen — no need to open the app.

Common mistakes

!Starting the timer late, so the numbers never match real life.

!Staring at the timer all day instead of trusting the widget.

!Ending a few minutes early and breaking your streak unnecessarily.

Your 20-hour timer, on your phone

Fast Goblin keeps the timer running with a live ring, milestone alerts, and widgets — and logs every finish to your streak. All on-device, no account.

Context

This page gives a simple 20-hour timer example and explains when a fasting app is better than mental math or alarms.

20-hour timer result

Timer field	Example
Fasting duration	20 hours
Start time	8:00 PM
End time	4:00 PM (next day)
Best use	fasting timer widget

How to set the timer

Pick 20 hours as the fasting duration.
Start the timer when your eating window closes, such as 8:00 PM.
Check progress instead of recalculating the end time.
End the fast when the timer completes, then review the completed fast in your history.

Why use this timer

A widget-style timer is useful when you want progress at a glance instead of opening the app again and again.

Common mistakes

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

How Fast Goblin helps

Fast Goblin turns a 20-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 20-hour fast into a clear progress screen with start time, end time, reminders, and history, so the timer feels easy to repeat.

Questions

How long is a 20-hour fast?

It is exactly 20 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.

Get a timer you trust.

Free on the App Store, private by design. Android coming soon.

Download on theApp Store

Related timers

14-hour timer 18-hour timer 20-hour timer OMAD timer