Mine gets taken off the charger around 7 am and I put it on the charger around 11:30 pm. Charge left is around 35%.
My settings:
Watch always in
Brightness = 5
Sound & vibrate on
All volumes set to 15 (loudest)
Vibration intensity = intense
Wake up gesture off
3G, WiFi, & NFC off
Bluetooth on
Notifications on for 29 apps