What is the maximum duration of flight for Multi-engine aircraft based on fuel capacity?

The maximum duration of flight for multi-engine aircraft based on fuel capacity is typically determined by several factors, including the fuel capacity of the aircraft, its fuel consumption rate, and the overall efficiency of the engines. In many general aviation and commercial multi-engine aircraft, a maximum endurance of around 3 hours 30 minutes is reasonable. This timeframe allows for a balance between operational safety and practical fuel management, accommodating diverse flight conditions and potential diversions due to unforeseen circumstances.

Aircraft are designed with certain safety margins in mind, which often means they can fly significantly longer than the minimum duration needed for typical flight operations. The choice of 3 hours 30 minutes recognizes that operators may face unexpected weather, air traffic delays, or need to land at alternate airports. It also aligns with industry standards and regulatory guidelines, which emphasize ensuring adequate fuel reserves to enhance safety. Therefore, this option reflects a realistic operational scenario consistent with multi-engine aircraft capabilities.