What clock face are you using? Those can have quite a big effect - for instance Slope Clock which updates once a minute still uses quite a bit of power because it's animated.
In order of power consumption (there are some figures at https://www.espruino.com/Bangle.js2#power-consumption):
GPS is a massive power draw, so yes, if you have it on the battery will flatten quickly - there's not really a way around that.
So to get the absolute best battery life, you want:
I have a bunch of watches here that I use for development, and for the ones sitting on the desk (especially if they just have the factory apps on) I reckon I must get almost 2 months
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