I have found that any more than 10 minutes for a new student is probably the limit of their endurance for each flight. Then, no more than three flights a day. At that point, the student is usually pretty numb with new information and flights begin tgo get sloppy. But, the NexSTAR, in the Deluxe configuration (RTF), which is what I had to learn with, lasted me over 14 minutes after I solo'ed. But that was orbiting and playing around at less than full throttle, doing touch and go's and so on. I never really ran it dry. But, when I finished flying, I recall that there was not much fuel left after the last flight of the day.

I know that does not help much, but if you run out of fuel, and you did that unintentional, then you really need to watch your flying time. Deadstick landings can really be trying if you are already at the end of the upwind leg.

One time, I orbited at the end of the approach end of runway trying to run out of fuel. This was with my Tiger 60. I was at about the 15 minute point and just ran out of endurance, so I landed. As I touched down, the engine quit. When I tried to defuel, there was none left.

DS.