I have this problem and it's called "bildungsroman take forever for me to read" and it eventually dawned on me that the reason it was taking me months to get through this book was that it was a bildungsroman and so my reading slowed to an absolute crawl.
This makes no sense because this story was a delightful mix of all the things I appreciate in a story and especially once it hit the fifty percent mark and started to spiral as a story, it was really good. It just takes me forever to get through the larval stages of main character development when the story is so episodic so I finish part and then put it down.