Short trips and jet lag: when staying on home time beats adjusting
On a trip of three days or less, it can make more sense to keep your body clock on home time than to adjust. Adjusting takes days, so on a short stay you would spend the whole trip partway through the shift and then have to undo it. Jetlag Away keeps you on home time when the stay between landing and your flight home is 72 hours or shorter.
Most jet lag advice assumes that adjusting to local time is always the goal. For a week-long trip it usually is. For a two-night business trip it often is not, and the reason is arithmetic.
The arithmetic of a short trip
Left alone, the body clock moves about an hour a day when it has to go earlier and about an hour and a half when it has to go later. Even with well-timed light, Jetlag Away’s fastest setting assumes no more than an hour and a half a day forwards and two backwards. How jet lag works has the full picture.
Take a six-hour shift. Even at the fastest rate the plan assumes, that is three days of moving westbound and four eastbound. Land on Monday morning, fly home on Wednesday evening, and your clock is still on its way when you board. Then it has to come back the other way: two adjustments, with the whole trip spent in the middle of the first.
Keeping the clock where it is avoids both. You do not arrive; you visit.
Is there evidence for it?
Yes, and it is the one strategy in the plan with a direct test rather than a mechanism. Lowden and Åkerstedt followed 19 flight attendants on a 50-hour layover from Copenhagen to Los Angeles, nine hours west. Each flew it twice: once switching to local sleep hours, once keeping their home-base hours. With home hours, “ratings of jet lag symptoms and sleepiness were greatly reduced during layover”, and the authors concluded it “may reduce jet lag during layover” [LA98].
What the study does not show is just as important:
- It tested one stay length, 50 hours. Nothing in the research the plan relies on tests longer stays.
- It was westward. Nothing tests an eastward short stay.
- The travellers were cabin crew, used to the routine. Nothing tests ordinary passengers.
- The benefit showed during the layover, not after getting home.
Why 72 hours
Jetlag Away draws the line at 72 hours, from landing to the flight home. That extends the tested 50 hours by about a day, so that a typical two-night business trip falls inside it: land in the morning, fly home on the third evening.
That number is a judgement, and how a plan is built says so rather than presenting it as a finding. A longer stay, or a trip entered without a flight home, is planned as a normal adjustment.
What a home-time plan looks like
When the stay is short enough, the plan moves nothing:
- No nights shifted before you fly. Your usual hours stay your usual hours.
- No light instructions after you land. There is no shift to drive, so there are no windows to seek or avoid.
- No arrival-day nap. There is no shift to rest through.
- Every night of the stay at your home hours, shown in local time with home time beside it, so you can see what your body thinks the time is.
- On the plane, your body’s own night is the one kept, not the destination’s.
Two things still apply. Every night keeps its caffeine cutoff, and the plan still will not let a journey keep you awake for more than twenty-four hours without a rest.
The Plan screen says which strategy it is using: “Staying on home time: your stay is short, so the plan keeps your body clock where it is instead of moving it and moving it back.” The progress ring shows “Home time” instead of a percentage, because there is nothing to adjust.
The honest cost
Home time is easier on the clock and harder on the calendar. Your home hours land wherever they land on the local clock:
- Flying west, they usually fall early. From Copenhagen to New York, six hours west, a 23:30 to 07:00 night at home becomes 17:30 to 01:00 in New York. That means an early night and a very early start.
- Flying east, they fall late. From New York to London, five hours east, the same night becomes 04:30 to 12:00 in London, which is hard to square with a morning meeting.
The cabin crew in the study made it work because their schedules were built around it. A business traveller with a 09:00 meeting may not be able to. Staying mostly on home time and fitting what you can around it is still a legitimate strategy, and for a short eastbound trip it is often the least bad one. Why flying east is harder covers why eastbound is the awkward case.
If home time does not fit your trip
Leave the flight home out of the trip. Without it, the plan adjusts you to local time as normal, with the pre-departure nights, light windows and everything else. You can also add it later: changing the trip rebuilds the plan around it, and nights already past stay as they were.
The choice is yours: the plan only keeps you on home time when it knows your flight home and the stay is short enough.
Sources
- [LA98] Lowden A, Åkerstedt T. Retaining home-base sleep hours to prevent jet lag in connection with a westward flight across nine time zones. Chronobiology International, 1998.
Jetlag Away is a scheduling tool and not medical advice. If you have a sleep or circadian disorder, or any diagnosed condition affected by sleep, talk to a healthcare professional first — see the health disclaimer in our terms.
Last reviewed 10 October 2026. Published 10 October 2026.