On average, pilots can expect to get 45-60 minutes flight PER GALLON of gas. With a standard 3.5 gallon tank, one could fly anywhere from 2-4 hours. This of course depends on factors like throttle use, headwind speed, payload, size of engine, fuel efficiency, glide-ratio, and flying-style. Many pilots enjoy climbing up to a high altitude, shutting the motor off, and utilizing the thermals to fly for hours. Once they get back down to a low altitude, they can reach back, start up the motor, and do it all over again! That being said, you could stay airborne all day if conditions were optimal!