Yoshi And The Mysterious Book is not an exceptionally long game. You will see most of its content on your initial run through a level, and there isn't much else to be seen other than this. As such, you could likely get the whole game finished within 20 hours. If you avoid ever replaying levels and exclusively rush right to the end of every level, you could realistically cut this down even further, likely to around 12-15 hours. Related
Every Main Yoshi Game, Ranked
The iconic dino has more than a few games to its name - here's our picks for the best of the bunch.
Being styled after and literally taking place within a book, Yoshi and the Mysterious Book has very convenient and self-contained Chapters. There are 12 of them in total, which are: Chapter 1 - Wildwoods
Chapter 2 - Mountaintops
Chapter 3 - Seaside
Chapter 4 - Settled Valley
Chapter 5 - Bug Country
Chapter 6 - Remote Isle
Chapter 7 - Underground
Chapter 8 - Tallest Of Trees
Chapter 9 - Miniworld
Chapter 10 - Moon
Chapter 11 - Special Studies
Chapter 12 - Mr. E's Challenges These are unlocked in three separate batches, but can be played in