Set up your engine on a board clamped to something sturdy. Using the 16 oz tank, see how long it runs. I bet you will find that it will run close to an hour on 16 oz. . There are too many variables here to pin the fuel consumption down exactly.

But if you find out how long it will run on the ground, well then you will know that it will run a little longer in the air than on the ground.

People can give you a figure but the most acccurate one will be with your prop, your altitude, your weather, etc and so on.

Good luck,

Jim