According to its listing on the Nintendo of Japan website, the highly anticipated Super Mario Odyssey will take up 5.7GB of hard drive space if you plan on purchasing the game digitally.
For comparison, Splatoon 2 took up 3.1GB, ARMS only took 2.1GB, and Super Mario 3D World took 1.7GB,
In this article:Nintendo, Supar Mario Odyssey, Switch