Well I took what I could from my sons phone and cut out a lot. It was a little chilly that morning and he was wearing shorts and shivering
So first flight was right about 6 minutes and I had 47% left on the battery but I wasn't doing too much on the first flight. By the fourth flight about the same time I had 27%.
I usually set the timer about 5 minutes. That gives me a little wiggle room.