An hour... if you have both colors of tape. I looked at the wiki before I saw watched the YouTube video, so I had only purchased the "fun-colored" tape.
Having to go back to the store to get the solid-colored tape.
Cutting the tape could get tricky.
Now my nephew wants one.
What made it easier:
TWO colors of tape - decorative (for the outside) and solid (for pockets and trim).
Pieces cut ahead of time.
Having clear packing tape for the ID (clear) pocket.
Doing this in one sitting. It's not something you can stop in the middle of...