The description on YouTube says that the elapsed time in making the book was 60 hours. I don’t know whether that includes the time for pressing components, waiting for glue to dry, etc. or just time working on the book.
The maker of the video has made a five-part detailed series on the making of this book, each part around a half hour.
Part 1: Folding Pages, Endpapers, Piercing, and Sewing
Part 2: Trimming and Rounding, Edge Decoration, Sewing Endbands
Part 3: Wooden Boards, Carving and Mortising, Attaching the Covers
Part 4: Paring and Applying Leather
Part 5: Leather Tooling - Brass Hardware - Final Assembly
Here is a video on making the brass “furniture” for the binding.