how long Apple Watch battery lasts?
how long battery should last?
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It depends on the device. Apple states it as being able to hold a charge for around 18 hours, more if it is in low power mode. The Apple Watch Ultra can hold a charge for up to 60 hours. I recommend charging it overnight, or during other times that it is inconvenient for it to be on your wrist (showering, etc.)
Apple by default enables a setting called "Optimized Battery Charging", which can help prolong your battery. It does this by looking at your daily charging habits, and waiting to fully charge until you need it. You can view more info here: About Optimized Battery Charging on your Apple Watch - Apple Support