How many hours time difference can cause jet lag?

The maximum possible jet lag between two points is 12 hours; e.g. between Helsinki and Honolulu in either direction. If you travel across the International Date Line, subtract the time zone difference from 24 to get the correct time difference. For example, an 18-hour time difference would equal 6 hours of jet lag.



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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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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.

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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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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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Suggestions on adjusting to your new time zone include:
  1. Expose yourself to daylight or, if this is not possible, bright light to help 'reset' your body clock. ...
  2. Drink caffeinated drinks in moderation during the day.
  3. Avoid alcohol or caffeinated drinks for a few hours prior to sleep at night.


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If you have the choice, try to book a flight that leaves between 8 am and noon and arrives between 6 pm and 10 pm. According to this book, flights that leave late at night (10 pm-1 am) and arrive in the morning (8 am to noon) give a much bigger risk for jet lag.

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But pilots are not robots, and they rarely become completely adjusted, says Landells. “Sensible rostering helps but if you are a long-haul pilot you know that for at least half your days off between flights you are going to feel awful.

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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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The most common reason is that there are no airstrips or airports on many of the small islands, so if a plane had to make an emergency landing, it would be difficult to find a place to land. Additionally, the Pacific Ocean is vast and remote, so if a plane were to go down, it would be very difficult to find.

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Is jet lag worse east or west? Yes. Adjustment to a new time zone is harder when traveling east than traveling west. This is because you “lose” time and you end up trying to fall asleep when your body is actually waking up.

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How long jet lag lasts will depend on several factors. These include how far you traveled, your body's unique rhythms and your overall health. Many people who experience jet lag feel better a few days after arriving to their destination. For some people, it can take up to one week to feel fully back to themselves.

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