Let's see: Trying to get all Rare blades, doing all side quests, doing all mercenaries missions, all heart to hearts, challenge mode battles and getting everything there. Yeah pretty fucking sure people will be playing more then just the main fucking story.
genuinely never understood how people ended up with hundreds of hours per xenoblade game. i played 2 for the first time and was invested enough in the story and cutscenes to cry at the ending, and i was done in 35 hours. i don't know how i possibly could've taken any longer