That’s my personal estimate for the game if you simply sit down at the beginning, and progress the single-player* storyline from start to finish, up to the end of the current expansion (a new one is coming out in a few months actually lol). Reading the dialogue and cutscenes, playing through the required quests, dungeons, and trials, and also playing through some of the optional (but also story driven and highly recommended) content.

So I guess it depends on what you mean by “story”, there’s dialogue and important story content happening during the actual fights most of the time. But in general I would say the vast majority of that time is pure story, to the point where I wouldn’t recommend the game to someone who didn’t like visual novels. Some players probably could do it in like 300 hours if they skim or even just read really fast, and I know many players who have taken well over 1000 hours as they took their time and did lots of side content.

*the vast majority of the game has optional multiplayer. I think the best way to play is with others but many people feel the opposite lol