Estimate how hard a trip will hit your body clock based on timezones crossed, travel direction, and arrival timing.
Jet lag occurs when your body's internal clock is out of sync with the local time at your destination. The general rule is that it takes about one day per timezone crossed to fully adjust.
AEO Answers
Direct answers for why jet lag happens, why eastbound travel is harder, and how timezone changes affect recovery.
Visa requirements depend on the traveler’s passport country and destination country. Check the destination rules for visa-free entry, visa on arrival, eVisa, required documents, and maximum stay before booking nonrefundable travel.
Flight time is estimated from the distance between airports, typical aircraft speed, route assumptions, and timezone differences for the departure and arrival cities. Actual flight duration can change because of routing, wind, aircraft type, and air traffic.
Jet lag is affected by the number of timezones crossed, travel direction, sleep timing, light exposure, arrival time, and how quickly your body clock can adjust. Eastbound trips often feel harder because they shorten the day.
A useful trip timezone briefing includes departure and arrival local times, the timezone difference, expected flight duration, sleep timing, business-hour overlap, and any date change caused by crossing timezones.