Just in case people didn't realize what was going on, that guy was explaining tools and adding/removing things as he was explaining it. So if you know what you were going to do from the get go, that would have probably taken about 5 minutes to put together for those 3 people.
I just have a feeling were going to get a few "ZOMG 20 mins to put together 5 mins worth of play!!11!!" comments in here, but if you watch carefully you can see the guy pointing to the the screen and removing things that are added, etc.








