I watched that very nice overview by Ian, but still got one problem with my Mavic Air 2. Even if my battery is full and the card has plenty of space I can't get 300, not even 200 frames. Whenever I have set another waypoint, the length goes back to small numbers, like a few seconds, and I can't extend it. Yes, I already understood that I don't need to take that camera angle literally. It is just about the amount of change, even just distance with a constant angle. So, I took care to have it confirmed as 'good', but still got this problem with the length. Any ideas?

TIA

I think I found the reason. You need a minimum of change between frames for the accepted maximum length. Since I only covered about 200 meters of distance, the drone didn't accept higher numbers. I'll have to change my concept, sigh. Wanted to shoot a rice paddy in different stages of growth, but 6 seconds is too hectic.
When I found the exact values, I'll post here.

Anybody seeing the same problem?