Our drones can fly almost continuously throughout the day.  For example with our Inspire we normally carry 7 batteries, each able to power the drone for 15-23 minutes.  We have a quiet petrol generator specifically for LiPO batteries and can simultaneously charge 2 batteries fully in about 45 minutes allowing us to provide as much flying and film as you need throughout the day, normally without interruption.  It takes about 60 seconds to land, change a battery and get airborne again.