The writing entertaining, else I would have not appreciated so you can be assured the writing style is great.
I would say because it takes too long with no big plot event and it doesn't really escalate ( like getting sad and sadder until the scene with the professor arrive for example ) the mood goes up and down but with no real big up so you're waiting for It to happens. It's all good for setting up places / characters / maybe story element but since it drags a lot on scene that can be viewed as non important (unless it will get important later ) it feels a bit long. Nevertheless it's good to get to know Hannah as a character but by doing so it's like getting lost along the way when you walk in a park before you finally see the thing you were searching for.
If I can resume it better : There is a lot micro events happening that feels like it should be important but don't feel important until the big event arrive.