Interesting info., next time you fly the Hunter Keith plug in your Data terminal and check the last run time on one of the engines, I'll bet you will be surprised at the amout of time between startup and shutdown, I'll bet it surprises you and is a lot longer than the 6.5 min flight time

I generally time 8-9min flights with my Rookie but total run time is in the region of 12mins+
We were out flying with Dave at Halsall these past 2 weekends with the big Airbus and his C130, both fly like on rails.
I've been flight testing my Rookie smoke system,........oh and working on a nice little engine at the other end of the thrust spectrum..... all good fun.
Regards
Rob.