Flight time
Hi! Jim, the question is are you using full throttle for the hold flight, how much fuel can it carry depend on how big is the model, the JMP T-33 is a large model, so it's fuel tank is bigger then the Y/A F-16, the location for the main fuel tank usually located in the C of G, bigger fuel tank mains longer flight time, bigger model mains it will fly slower, make your decision.

Raymond Ng