Battery

Hello. How long battery in IPhone 7 should last? I bought a new one 4 months ago, and I use it mostly for social media and texting, mostly on Wi-Fi. I have bluetooth, background refreshing turned off and the auto brightness turned on. I can use it for 6-7hours (of course a lot more in standby mode) and a 2-3 zetrą hours in low power mode. Is this normal?