Board Thread:Questions and Answers/@comment-25033368-20140607123603/@comment-1824272-20140607130916

In my experience thus far of playing the game, I have yet to play for 12 hours straight. I think you've got larger problems to deal with if you're playing Online Co-Op Missions for half a day without break...

But if your experience tells you that 3 fuel lasts 30 minutes, then yeah, 72 fuel would seem to be accurate.