iPhone 13 Pro battery life

Hey everyone, I have a iPhone 13 pro, and I’ve seen a lot of reviews on YouTube shaking of the battery like and I see that a lot of people are getting 6-8 hours screen on with the brightness quite high. I keep my brightness low (just above the sun symbol) and I’m getting like 4 hours of battery life. I’m a bit confused as to how these other people get so much battery life. Also on standby the battery drains a lot.