overheat

Hi guys, is there a max flight time if I have multiple batteries? Like if I were to fly multiple trips, will I ever have to worry about the motors overheating? or any other damage with prolonged flight? Thanks for your time!

Just wondering if anyone else is seeing something like this. I am having intermittent video issues when I am in the air and I think I may have found the problem.. The transmitted picture may roll (as in vertical hold problem), fragment, freeze, or just go black. Telemetry is all good, no gps...