I just posted one a few days ago. Took me about a day to do this. Used some software but then had to add in pictures from Adobe After affects and keyframe out any motion covering them which took some time. I also added in speed ramps for the start clip, and then blurs and pictures. Tried to make it a bit like the simpsons with the laughing.
Is meant to be a bit of fun HiFi but it is surprising how some people see it as too serious. I do serious honest reviews too which take loads of effort (often around 100 hrs) because I like the creative production side of video production. It's not just about HiFi for me and what I get out of it is the creativity
https://youtu.be/t907Aq8maV8