Ended up with 48 hours or so - but the last 10% I killed intentionally faster by activating 4G, GPS, and playing games. I think the biggest boost to battery performance was turning off auto-sync and background data. I put widgets up on my home screen that let me easily toggle all the antenna's (4G, GPS, Mobile, wifi) and syncing settings. I also turned off haptic feedback and adjusted the screen brightness. Its basically restored to a phone/text device - with data features on demand.