It's tought to call them quests, more like conversations and battles. An hour and a half of gameplay tops.1 or 2 more main quest, and then that's you done.
Also, finally beat the game today! I started playing day 2. Kept going in December, but went home for Christmas and New Year's. Then I didn't have much time to play in January and also the long break made me lose some enthusiasm (it's like waiting for a sequel to a book: the first couple days are torture, but the months and years that follow are ok) to go back. February was mostly spent at home due to winter holiday, lol. Over the last couple days I put some serious hours in and finally beat it this evening!
Overall I really enjoyed it. The companions are truly something else. Will probably write more later.