While at work, it dawned on me that there's one thing I can do that would absolutely save battery life (I'm hoping this will extend battery life).
During the day, while I'm at my desk, I really don't need my reminders/messages being pushed to my watch. I get Pushbullet messages on my browser on the cpu. And, while I'm in the car, I'm not a fan of looking at messages while on the road and with A2DP bluetooth and Samsung's S Voice, I can have text messages read to me, if it's really important.
Answer=Mute notifications, while driving or at my work desk. I can't really test how much battery life this will save me, but I think this will help me accomplish the 2 day (48 hour) timeframe that I'm hoping to accomplish.
The battery life, with extremely heavy activity, has been enough to get me through 12-14 hours. When somewhat standard activity, I barely get to 24 hours. And, it's so simple to Mute/Unmute, that it'll be no problem getting in a habit of toggling back and forth, depending on whether I'm walking/driving/working.