For video, I very much shoot a scene, then move to the next. Sometimes I’ll keep recording, but often not. Makes it easier to edit too.
If you have 20 minutes of footage to search through for all the good bits, it gets a bit tedious, so shorter clips is a much easier workflow.
I also keep it at 30% reserve. No need to use a stopwatch though, the app tells you how much time each flight has taken in your profile. Also shows you a full map with the track, altitude, speed etc.
I can’t remember what drone you have, but I think it was the air 2? If so, you should get 25-27 minutes on a battery generally of course depends on flight conditions and distance. I only get about 15 on my 2 pro, which is a bit of a bummer, but that’s just how it is.