With my Raptor 50 Hyper. I also get about 10mins on main and 14mins with header, but I quit when the main empties. My heli gets richer when I start drawing on the header only until the very end of the header tank where it will lean out just before quiting (not good to do). I think I am running just about the right mixture. I can hold finger on back plate indefinately after flight, but it gets pretty uncomfortable. If anything I may still be a little rich, but I'd rather be there than lean. So I think 10/14 mins for Raptor 50 Hyper is about right.