10-11-2021, 09:34 AM
This before I saw your last post, not wasting a good animation 
If you use the script-fu a second time sometimes it can hide under the Gimp window. It should show in the task bar or minimize Gimp to find it, then maximize the Gimp window to usual size.
You are using the deviantart .ai file thumbnails, 10-out-of-10 for perseverance but the whole image is only 1000x800 px
I can get gradients out of those thumbnails but you have to be careful. Try putting the path tool into 'Polygonal' mode to draw straight lines (and remember to untick when finished or it will be there to confuse you for evermore)
The default values work here and slightly less sampling as well. I can just get it into 60 seconds for imgur https://i.imgur.com/6eXc9Vz.mp4
If you use the script-fu a second time sometimes it can hide under the Gimp window. It should show in the task bar or minimize Gimp to find it, then maximize the Gimp window to usual size.
You are using the deviantart .ai file thumbnails, 10-out-of-10 for perseverance but the whole image is only 1000x800 px
I can get gradients out of those thumbnails but you have to be careful. Try putting the path tool into 'Polygonal' mode to draw straight lines (and remember to untick when finished or it will be there to confuse you for evermore)
The default values work here and slightly less sampling as well. I can just get it into 60 seconds for imgur https://i.imgur.com/6eXc9Vz.mp4