Incheon International has been ranked the best airport in the world for nearly a decade straight and it unquestionably deserves that title; however, spending 5 hours in any airport is a bit excessive. There are fantastic shops, wonderful restaurants and interesting live performances including classical five-piece string mini-orchestras and even a Royal procession complete with period costumes so it's not a bad place to kill some time. On top of all that, you can add that it's also the cleanest, most well-organized and most efficient airport I have ever had the pleasure of visiting, and I have visited quite a few.
But even with all that being said in its favor, three hours is more than enough time to spend there.
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