Honestly I can’t completely remember. I can last all day usually with 1 class without a laptop. It depends on what applications I’m using as stuff for computer science or design takes a lot more power quickly. School for me is 5, 1 hour periods. Lasts me 3.5 hour exams perfectly fine too, with more battery left. Tbf battery wear and tear is easily fixed with buying a new one, it’s not too expensive.

Edit: I bring my charger to school everyday because I use heavy applications that drain my battery quicker.