Those are great questions. You could cycle through 10 to 20 low cost drones but the battery life is the interesting part. It will be a experimental batt and energy system which can quadruple or even yield longer then expected. Also when it comes to cost if it’s contracted to a company to watch a subdivision like an ADT like company. To watch for a fraction of the cost of a live security guard plus they have five to six times more visual coverage then a single security guard too. And as far as fly them they would be on a preset trail around the streets in random patterns. All the observer has to do is watch and if they had to control one to get a better look then they can control it individual to better see the situation. Also the high of these drones would be set so they could not invade in people privacy accidentally or on purpose.
This is a great business idea! 1 person per 6-12 drone feeds on two monitors with separate set paths to take. I think you could really make a profitable business being the new “ADT” in town and soliciting the neighborhoods and HOAs for cheaper security. They would probably have to be self-docking drones that could charge themselves and then fly out, like you said – on a cycle.
Ya it would have to be self docking and if there are any tech issues. They would have there own tech support to come out and fix down drones. Also each system will come with its on weather station system as well to detect up coming conditions for the drones