Battery life and uni Watch
(Taking pharmacy btw so no rendering or any heavy load programmes are going to be used)
(Note: I would research the wifi situation at your university first though as, although you can type notes/documents on them without internet, Chromebooks work much faster with decent wifi connection)
In terms of guessing battery life, there are a few things to consider. What the battery capacity actually is, what hardware you have and how you are using it. Web browsing is more demanding than writing a Word document. Streaming media is even more demanding. Gaming laptops, or anything with a dedicated GPU suffer drastically reduced battery life. And so on.
Besides that, your actual use case matters. It doesn't matter if your battery lasts for 4 hours if you'll only ever be away from your charger for 3 hours. It's not ideal, but the battery life you specifically need matters more. And that's not something we can determine. If you're the sort of person who will be out and about all day, you'll want "all day" battery life. If you're the sort of person who flits between class and home you won't care as much.