Jet Lag Recovery: How Long Until Your Body Clock Catches Up
Jet lag fades gradually, not overnight. A simple rule of thumb turns the size of the time shift into a realistic recovery window.
What is the Jet Lag Recovery Calculator?
Enter how many time zones you crossed and whether you flew east or west, and the calculator gives a rule-of-thumb recovery estimate: about one day per hour eastbound, when the body clock must move earlier, and about one day per two hours westbound, when the shift is usually easier. It is a rough planning estimate, not medical advice, and sleep, light, and meals all affect real recovery.
How to use it
- Enter how many time zones you crossed.
- Choose east or west for the direction of travel.
- Click Estimate Recovery.
- Plan light exposure and sleep around the estimated days.
Worked example
Crossing 6 time zones eastbound gives an estimated recovery of 6 days.
How long does jet lag last after crossing 6 time zones east?
Roughly 6 days, at about one recovery day per hour of eastbound shift; westbound travel usually recovers faster, at about one day per two hours.
Frequently asked questions
Why is eastbound jet lag usually worse?
Flying east forces the body clock earlier, which most people find harder than the later shift of westbound travel.
Is this estimate medical advice?
No. It is a planning rule of thumb; illness, poor sleep, or a heavy schedule can all slow real recovery.