While only having Safari open watching videos and doing general web browsing, my 16gb M1 Macbook Pro barely lasts 8 hours. This is while the screen brightness is at half and speakers are at half volume. Currently I'm on 45% charge and Activity Monitor claims that I only have 3:30 remaining (while only Safari, Finder and AC are running). This seems way too low compared to what other people are getting, especially since the battery health of my machine is claiming to be 100%.

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edit: updating to the beta version of macOS 11.3 pretty much doubled my battery life. Now getting around 12ish hours while doing semi intensive tasks (zoom / programming) and 16 hours of web browsing.