Hello, Patrick, and welcome!
Battery life is all dependent on application, as KGB7 alluded to.
For example, if I take a Sony VTC4 (2100 mAh) and put it in my Vamo, vaping at 8-9 watts, I can pretty much get a full work day out of it.
That same battery in a mechanical with a low-ohm RDA will last about two hours, depending on the resistance of the coil.
We need to know what you are using.