how long should a nitro rc with a.18 engine and 75cc tank run on a full tank of gas?

i just purchased a volcano sv and it seems to go through a full tank pretty fast, about 10 mins. is this normal. how long should it run?
i just purchased a volcano sv and it seems to go through a full tank pretty fast, about 10 mins. is this normal. how long should it run? email me at miah788@yahoo or hotmail.com if you have any tips on getting started on nitro rc

Yea my HPI Nitro RS4 2 goes through a full tank in like 5 mins. If you have a body for it just cut out the window and pour in some gas every so often. Have a squeeze bottle handy.