The Antonov An-225, often referred to as the "Mriya," is the largest aircraft in the world by both weight and wingspan. Refueling such a massive aircraft requires a considerable amount of time. The refueling process for an Antonov An-225 typically takes around 30 to 45 minutes. This duration includes the time needed to connect the refueling hoses, the actual transfer of fuel, and the disconnection of the hoses.

The reason for this relatively short refueling time, despite the aircraft's massive fuel capacity, is the use of high-flow refueling systems. These systems are designed to handle the large volume of fuel required by the An-225 efficiently. The refueling process is further streamlined by the presence of a refueling boom, which can be quickly connected to the aircraft's refueling receptacles. This boom is capable of delivering fuel at a high rate, allowing for a rapid refueling operation.

According to data from Antonov, the An-225 has a fuel capacity of approximately 84,000 US gallons (317,000 liters). The aircraft's engines are designed to consume fuel at a high rate, especially during takeoff, when the engines need to produce maximum thrust. The refueling systems are engineered to meet these demands, ensuring that the An-225 can be refueled quickly and efficiently.

The use of high-flow refueling systems is not unique to the Antonov An-225; it is a standard feature in large military and commercial aircraft. However, the An-225's sheer size and weight necessitate a more robust and efficient refueling system. The aircraft's ability to carry massive payloads, including other aircraft, requires it to be refueled quickly to minimize downtime.

In summary, the refueling time for an Antonov An-225 is approximately 30 to 45 minutes, a duration that is optimized by the use of high-flow refueling systems and a refueling boom. This ensures that the aircraft can be refueled efficiently, allowing it to continue its operations without significant delays.