Hi G-Man,
For time, if you are flying the pattern, you are fine with the 8 oz. tank. Like Doc, I don't like to go much over 6:30 stop watch time, and that's from the hand signal. I got a funny feeling that we *might* get a rules proposal in the not too distant future to adopt the FAI 7 min. max time from signal to wheels stopping. I would be for it!