at some point after 10-20 flights of 40mins or more you realize its pretty exhausting to pay so much intense attention for so long.It's used. Makes one wonder why it is being resold!
I know I used to race RC cars and at full pelt, the battery pack only used to last 5mins or so. I can tell you if I was really competing it drained the crap out of me mentally. I was very much like zoned in. With a Mavic drone, much less so, but perhaps the owner has seen all he ever wants to see. Really reached his 11km and done.