How to extend video duration with AI?

[ARandomPerson]

Hello, my goal is to create an AI video that is constantly moving in specific angles and lasts 3-4 minutes. I initially visualized the image in my mind and created it using Bing. Then, through various research, I used the runaway program to animate the video the way I wanted by providing a prompt to this photo. However, the free version of the program only allows a total of 4 seconds for animation. Can I create a video for the desired duration with the Unlimited version? Or is there another method to achieve the desired length and movement for this video?