For passengers transiting through Hamad International Airport (HIA) in Doha, the "maximum" layover time is effectively defined by the 24-hour rule for standard transit. If your connection is less than 24 hours, you are generally considered a transit passenger and can stay within the airport's airside "Quiet Rooms" or the luxury Oryx Hotel. However, Qatar Airways actively encourages longer stays through its "Discover Qatar" stopover program, which allows you to extend your layover for up to 4 nights (96 hours) at very discounted hotel rates (starting around $14 USD in 2026). If your layover is between 8 and 24 hours and there is no shorter connection available, Qatar Airways may even provide complimentary "STPC" (Stopover for the Purposes of Connection) hotel accommodation, though this must be confirmed based on your fare class. If you plan to stay longer than 24 hours, you will need to clear immigration, which for many nationalities involves a free visa-on-arrival. Doha is specifically designed to be a "stopover hub," so there is no strict upper limit on how long you can stay in the country, provided you have the appropriate visa and a confirmed onward ticket.