Well, Mario Maker is all about giving players the tools to create their own levels rather than having a specific story-driven mode. You get to express your creativity freely!
The story mode in Mario Maker 2 varies in length depending on your skills and how much you explore. But on average, it could take several hours to complete.
The number of levels in Mario Maker 2 story mode isn't fixed. It depends on different factors like your gameplay and completion of specific tasks. But there's a decent amount to keep you engaged for a while.