Whenever I try to create clips longer than five seconds, they don’t seem to finish rendering—or perhaps I just don’t have enough patience.

Could you render a next video from the end frame of the video?...then blend them together in a Video program like DaVinci Resolve.

I've found adding a reference point for your character to walk to can help in terms of video length, even if its off camera to get an extra couple of seconds if you need it. AI will guestimate whats not framed in the camera but it usually does pretty good in terms of the scene.

I render the animations with aire Motion and everything works with 5 sexond animation! They need around 9 Min. When I tried to make it 10 seconds I stopped the calculation after 30 min and 20% progress!

Thank you:-) By the way, I can write the prompts in German and they actually work—better than I could manage in English! I’m not sure if that was intentional, but it’s just fantastic!