Since the deadline you set is Dec. 15, I'm guessing it's because of the work-what's still left as of now?
finish the graphics, then do vocals for all the jingles, and do the narration, and then do the entire score. to put it in perspective, this is about the equivalent of where i was on dec 10, 2015 for the history of japan video, which was released on feb 2, 2016. and this video is about twice as long