I think when Larian announced it was a 25 hour-ish playthrough, they were saying it from the perspective of someone who already knows the game.
WHAT? 25 hours of content? Larian is a bunch of filthy liars! I'm up at 140+ hours, and I haven't finished the teahouse, the goblin camp, or even reached the underdark yet!
Of course, I'm playing in "savor it" mode, stopping to smell every rose and open every crate.
I can afford to do this because I am retired. Envy me.
Of course, I see a problem. There's a rumor that there will be EVEN MORE content arriving someday. How many months will I need to put aside to play through that?