# How to set a different intermittent fasting eating window for each day of the week

> Plan time-restricted eating around shifts, weekends and social meals: map your fixed commitments, set each day's window, then check the plan against what you actually ate.

Published 2026-11-02 by ODEL.

To set a different eating window for each day, plan the week in advance: write down each day's fixed meal commitments (work breaks, family dinners, a Saturday lunch out), then place that day's eating window around them, keeping the length you are aiming for. A spreadsheet, a calendar or a fasting app with per-day schedules all work. Then compare the plan with when you actually ate, and adjust next week's plan rather than forcing a rigid window that does not fit your life.

> Not medical advice. Talk to your doctor before time-restricted eating if you have a health condition, take medication, are pregnant or breastfeeding, or have a history of disordered eating. This guide only covers planning and logging.

## Why one fixed window often breaks

A 12:00 to 20:00 window is easy on a regular office week. It falls apart with rotating shifts, an early gym day, a late family dinner on Sunday or a breakfast meeting. When the window does not fit, people either skip the plan entirely or feel they have "failed". A per-day plan starts from the week you really have.

## Step 1: Map the fixed points of your week

Take a sheet of paper or a spreadsheet with the seven days across the top. For each day, write:

- when you wake up and go to sleep
- work or shift hours, and when breaks fall
- meals you cannot move: family dinner, team lunch, a weekly brunch

Shift workers: use your actual roster for the coming week, not a typical week.

## Step 2: Choose the window length you are working with

Decide the length you and, if relevant, your doctor are comfortable with, for example a 10-hour or 8-hour eating window. You can use a shorter window on easy days and a longer one on demanding days. Consistency of planning matters more than squeezing every day to the same number.

## Step 3: Place each day's window around the fixed points

For each day, place the window so it contains the meals you cannot move. Examples:

| Day | Constraint | Planned window |
|---|---|---|
| Mon to Thu (day shift) | Lunch break 12:30 | 10:00 to 18:00 |
| Fri | Dinner with friends 20:00 | 12:00 to 21:00 |
| Sat | Brunch 11:00 | 11:00 to 19:00 |
| Sun | Family dinner 19:00 | 11:00 to 19:30 |
| Night shift days | Meal break 02:00 | Plan around the break, and keep the gap before sleep you are comfortable with |

Also write the planned meal times inside each window. "Window 10:00 to 18:00" is easier to follow as "brunch 10:00, late lunch 15:00, last snack 17:30".

## Step 4: Write the plan where you will see it

- **Paper:** stick the week on the fridge.
- **Calendar:** create an event for each day's window, so your phone shows "Eating window 12:00 to 21:00" on Friday.
- **A fasting app with per-day windows:** several apps let you schedule windows by day. MyFast, for example, schedules fasting and eating windows for the whole week and can run its timer from that schedule ([App Store](https://apps.apple.com/us/app/myfast-fasting-timer-app/id1218416683)).

## Step 5: Log what actually happened

Plans and reality differ. Each day, note when you actually ate and anything that changed: an overtime shift, a late dinner, a skipped meal. Without that, you cannot tell whether the plan is realistic.

## Step 6: Review on Sunday and plan the next week

Look at the gaps between planned and actual. If Friday's window slipped three weeks in a row, the plan is wrong, not you. Move it. Then set the next week's windows from the new roster.

## Doing it in Fasting Week

[Fasting Week](/app/fastly) is an iPhone app built around this weekly routine:

1. **During setup, choose your routine and planned meal times.**
2. **Review the seven-day plan and set each day's eating window**, so a work day and a weekend can differ. Save it.
3. **Record your actual meals** with times and notes next to the planned window, which covers step 5 above.
4. **Start the fasting timer yourself** when you finish eating. The plan and the timer are separate, so the timer does not start from the clock if your day changed. Optional reminders, widgets and Live Activities keep it visible.
5. **Log protein, water and weight** if they are part of your routine.

Fasting Week needs no account, shows no ads and stores meals, windows, fasts and logs on your device. It does not sync with Apple Health in the current version. It is iPhone only and free to download, with optional Premium. It does not tell you how long to fast; that choice is yours and your doctor's.

For other apps, see [the best intermittent fasting apps for iPhone](/best/intermittent-fasting-apps-iphone) and [Fasting Week vs MyFast](/compare/fastly-vs-myfast).