Two to three days is typical under normal use — checking the time, with the occasional app — when the watch is new or relatively new. Battery life depends mostly on how often the screen and the LEDs are on.
Heavy animations, bright LEDs or code that keeps the processor busy will drain it noticeably faster. If you write your own apps, coding a sleep mode into them so the watch powers down between interactions makes a real difference.
If a fully charged watch runs flat within a few hours of light use, that is not normal. Message us here, or email [email protected], with your order number and we will take a look.