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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The length of the flight per se doesn't cause jet lag, only the difference in time zones does.
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.
It usually takes 3-4 days after your flight to recover. Though jet lag symptoms can be pretty uncomfortable, take heart in the fact that they usually don't last very long.
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.
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.
If traveling west, crossing multiple time zones, as long as you're not traveling late at night already, have a cup of coffee or two pre or mid-flight to help your body adjust to time lost. If traveling east, avoid consuming coffee before or during your flight as this can exacerbate the effects of jet lag.
On arrival, stay awake until an early local bedtime.
If you doze off at 4 p.m. and wake up at midnight, you've accomplished nothing. Plan a good walk until early evening. Jet lag hates fresh air, daylight, and exercise.