Create a 10 hour loop video from a short one and export it fast

Hi, I have a 50 second long video and want to create a long 10 hour loop video. I copied the short video in the timeline, created transitions, tried to copy and paste this sequence but it doesn’t work in Shotcut. Therefore I created a 10 min video in order to create a 1 hour video and so on, but maybe there is an easier way to do it? Also, what can I do before exporting the video to compress it or reduce its size without reducing its quality and maybe there is another software which does it bet

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