I have found at about 18mins in I get the 30% battery life warning. Given I am typically flying it over water, taking off and landing from small boats I start to bring it in then. You could probably go 25mins and be ok, depending on how far out you are flying it.
Moses I think they are going to get cheaper and better with time. We have not had a "big", meaning bad, event with one yet but it will happen. Then the legislation will start in earnest. Are they any more dangerous than your fellow skiers, bikers, paragliders, skydivers??? With these other hobbies if there is an accident it is typically with other people who are "accepting" the same risks or accidents that just involve the participant. How many times a day does someone on a bike ram into a pedestrian?? But since it is not sensational no reporting. The problem here is a drone hitting a school bus, getting sucked up by a jet...Of course I am responsible with flying mine;) it is the other guy and those "other guy" ranks are growing.