How long would the Legion 5i pro gen 8 battery ACTUALLY last?

I’m looking at buying the legion 5i pro and I’m pretty set on buying it, but I’ve heard some reviews about the battery and how it’s pretty mediocre. I’m gonna be using my laptop for college and aren’t sure if I should get something with a better battery or if it won’t matter, either because the battery actually isn’t too bad or I won’t need to have it unplugged for too long at college.