So, is this game pretty short for a Mario game or is it normal that you all finish it in a day? I've only played for 2 hours and I'm flying through the game as well. It's lovely but compared to spending 170 hours on BotW this seems like a small snack?
I'd say that if you breeze through the game with the bare minimum it'd take you around 10 hours to beat it, and it's actually the standard for 3D Mario games. But it seems that SMO has way more content that any 3D Mario game. And I really love Mario games post-game generally.