The amount of time it would take you to circumnavigate the Earth on commercial airplanes would depend on a number of factors, including the specific flight routes, layover times, and flight availability. However, assuming that you could book a continuous series of flights, and that each flight was on time and without significant delays, it would likely take between 50 and 70 hours of actual flight time, plus layovers.

Here's one possible flight plan that would allow you to circumnavigate the Earth, starting and ending in Los Angeles, California:

1. Los Angeles, California (LAX) to Tokyo, Japan (HND or NRT) - 11 to 12 hours
2. Tokyo, Japan (HND or NRT) to Singapore (SIN) - 6 to 8 hours
3. Singapore (SIN) to Cape Town, South Africa (CPT) - 10 to 13 hours
4. Cape Town, South Africa (CPT) to Rio de Janeiro, Brazil (GIG) - 11 to 14 hours
5. Rio de Janeiro, Brazil (GIG) to Los Angeles, California (LAX) - 10 to 12 hours

This flight plan assumes direct flights between each city, but you may need to make connections in other cities depending on flight availability. The total flight time for this itinerary is approximately 48 to 59 hours, depending on the specific flights you choose, and the total travel time would be longer due to layovers and travel time to and from the airports.

It's worth noting that this itinerary could change depending on visa requirements and other travel restrictions, as well as changes in flight schedules or availability. It's important to check with airlines and relevant authorities to ensure that your travel plans are feasible and safe.
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