Thank you very much! :)
That estimate is for the entire game, but the word count used for it is a bit outdated.
It's now 5-8 hours with voice acting turned off, and we're still missing the Backer ending (they haven't sent us their info yet, so it's looking like it'll have to be added in a future update). If you're playing with the voice acting turned on, it's probably closer to 6-10 hours total.