Thank you!
The game will be definitely more than one week. The first week in its entirety (minus some scenes at the very end of the last day) is already available on Patreon, and will be here for free at some point in the future (likely after Chapter 3 is out for patrons).
So, I'm hoping for it to be a week / chapter, and I haven't landed on exactly how many chapters there will be, but I know I want a big game that feels pretty rich. I'm approaching it almost as a season of a TV show, where each chapter is an episode.
Now, whether the full game will be available on Itch depends on what the situation for NSFW games is by then with the payment processors etc. Hopefully by the time the game is done, the situation is a bit more stable.