Jet Lag Recovery for Maximum Time Zone Crossing (12 East)
Calculates recovery time for the most extreme jet lag scenario of crossing 12 time zones heading east.
How to use this tool
- Enter the number of time zones your flight crosses.
- Select whether you are flying east or west — eastbound travel is generally harder to recover from.
- The calculator estimates recovery days based on the commonly used 1.5 days per time zone rule.
A 12-time-zone eastward crossing is the maximum possible jet lag — your body's circadian rhythm is completely inverted.
Frequently asked questions
- How long does jet lag last?
- A common rule of thumb is one day of recovery per 1.5 time zones crossed. Eastbound travel is usually harder; westbound travel allows the body to extend its natural day.
- How can I recover from jet lag faster?
- Adjust your sleep schedule before departure, stay hydrated, avoid alcohol on the flight, get natural daylight at the destination, and try melatonin if recommended by your doctor.