Japan is one of Santa's big stops. He stops at big cities like Tokyo which takes him about 4 minutes even though Japan has a lower rate of believers than countries like United Kingdom and United States of America because it's so big that it takes him a while. He also likes to go to Mount Fuji where a video will usually be shown every year of him and his raindeer riding around the beautiful mountian.
Japan's high population means Santa has lots of pit stops, but he just started his long trip so he has lots of energy