For flights booked on a single ticket, the transfer of bags is handled by the airline and typically takes 45 to 90 minutes, depending on the airport's size and efficiency. Modern hubs use automated sorting systems that can move a bag across terminals in under 30 minutes, but a "safe" layover is usually 1.5 to 2 hours to account for delays. If you are self-transferring (booking separate tickets), you must collect your bag from the carousel and re-check it at the departures desk. This process requires a minimum of 3 to 4 hours, as it involves clearing customs, waiting for luggage, and passing through security again—a high-risk maneuver if your first flight is even slightly delayed.