where is the rest of the group?
everything is too dependent on other factors. are you using an edf? 3500kv with a 5x5 prop on a flying wing? 500kv motor for a 60 sized airframe? who knows. the same battery you asked about might be 3-4 minutes on the first two motors, and 10-20 minutes on the second. but I have no idea how fast you need the prop to spin to.be efficient, I Dontt know how slippery the airframe is.
powered glider? sure. .10 sized pylon racer... not so much.