>>3835408
Depends on how much you want to do. There's a lot of extra content that opens up near the end of the game (and after it). If you are playing the game because you enjoy it - which imo should be the only reason you play any game - you can easily keep playing for dozens of hours more.
Off the top of my head you've got (counting the bladedrifts) 6 story dungeons left, with a lot of plot going on in-between those. And some of them are pretty big dungeons, as you'd expect.

You're getting there but even in terms of just straight minimum completion you've maybe got about a quarter of the game left.