I fly about 110 to 120 times a year, as you can easily guess from my Dopplr page.
In my case, roughly half of these flights are longer than 4 hours, and involve a noticeable, but not huge, difference in time zones. In fact, since I live in Singapore, most long flights go “vertically” south to north or vice versa, and not “horizontally”. India is usually two and a half hours behind Singapore.
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