[日本語がまだありません。書く暇が出来たら書きます。^^;] Some of the booths were set up in a way to keep you there for as long as possible - I guess the more people huddled around the booth - the more attention they get?
For example, they make you line up and once you are in the stand they give you a long explanation of the game controls before you get to play - taking a good 20 - 30 min of your precious time.