Well, this was a rather unique set of circumstances. This set has over 4,100 pieces, placing it in the uppermost echelon of complexity across the entire history of LEGO. I didn't track my time well, but I'd estimate it took about 5 to 6 hours to assemble. However, the review video came out to less than 4 minutes, in spite of very casual pacing, looser-than-normal editing, and a generous look at both main sides of the box. How, and why?
Well, there's a ton of repetition in the structure, with 3 or so patterns covering at least 80% of the volume of the build. Building techniques are rather straightforward. There's really nothing at all to see on the reverse side, and there's no interior to peer into. There is a geared "action" feature, but it's as straightforward as the rest of the build, and exposing for display requires some destructive disassembly. What you see is what you get!
I suppose I could have could talked about the build process, but like I said, it's not very complex. I could talk about the parts, but, well, actually I did, several times and for a substantive portion of the video. I could have Googled a bunch of factoids about the real building, but you could do said Googling on your own time, if you so desired.
In short, I covered everything I felt the video needed to, and I had no interest in artificially supplementing the length with extra fluff. If I had to do it again, I would change very, very little.