An 8-hour layover is the "sweet spot" for travelers—long enough to leave the airport but short enough that you must be efficient. First, subtract 3 hours for logistics: 1 hour to clear immigration/customs, 1 hour for round-trip transit, and 1 hour for the security buffer. This leaves you with 5 solid hours of exploration. If your layover is in a well-connected city like Singapore, Dubai, or London, you can easily take an airport express train to the city center, visit one major landmark (like the Burj Khalifa or the London Eye), and have a proper local meal. If you prefer to stay at the airport, 8 hours is perfect for booking a sleeping pod or transit hotel for a 4-hour nap, followed by a visit to an airport lounge for a shower and a meal. In 2026, many major hubs now offer "Free City Tours" for transit passengers; check with the "Transit Information" desk upon arrival to see if you can join a guided bus tour that guarantees you'll be back in time for your connection.