What is the formula for jet lag recovery time?

To calculate the amount of days it takes to recover from jet lag, the International Civil Aviation Organisation (ICAO) developed the following formula d = u 2 + ( z - 3 ) + v + a 10 u is the number of flight hours of the trip, and is the amount of timezones passed.



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Jet lag symptoms usually occur within a day or two after traveling across at least two time zones. Symptoms are likely to be worse or last longer the farther you travel. This is especially true if you fly east. It usually takes about a day to recover for each time zone crossed.

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Minimizing jet lag
  1. Gradually switch before the trip. For several days before you leave, move mealtimes and bedtime incrementally closer to the schedule of your destination. ...
  2. Stay hydrated. ...
  3. Switch your bedtime as rapidly as possible upon arrival. ...
  4. Use the sun to help you readjust.


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It is widely acknowledged that jet lag is worse when travelling east, but this has nothing to do with the direction of Earth's rotation. Like many creatures, humans have a circadian rhythm that follows a 24-hour period and is kept in sync by the eyes' response to natural light levels over the day.

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The more time zones you cross, the more likely you are to be sleepy and sluggish -- and the longer and more intense the symptoms are likely to be. Jet lag is a temporary sleep disorder, but not temporary enough for many travelers.

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Common ways pilots avoid jetlag is staying hydrated, good rest, avoiding caffeine and alcohol, exercising, or sleeping on the airplane. For long-haul flights airlines use multiple pilots for the flight to allow each pilot to get some rest. The more time zones that are crossed, the worse the jet lag.

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Can jet lag last 3 weeks? Depending on things like how far you've flown, the direction of travel, your age, and your chronotype, jet lag can last from a few days to a few weeks. High sleep debt may be causing feelings of jet lag three weeks after your flight, though.

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Most people find that jet lag is worse when traveling east than it is when traveling west. View Source . Jet lag differs based on the direction of travel because it's generally easier to delay your internal clock than advance it. Jet lag does not occur on north-south flights that do not cross multiple time zones.

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Flying east or west makes a difference to jet lag This is because travelling west 'prolongs' the body clock's experience of its normal day-night cycle (the normal tendency of the body clock in most of us is slightly longer than 24 hours). Travelling eastwards, however, runs in direct opposition to the body clock.

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Jet lag is worse and longer-lasting when you travel east than west.

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After you arrive
  1. change your sleep schedule to the new time zone as quickly as possible.
  2. set an alarm to avoid oversleeping in the morning.
  3. go outside during the day – natural light will help your body clock adjust.


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