I was thinking about getting one, and I see that they can be used as a watch. But I would think if you're using it as a watch that it wouldn't be able to last that long. Even if it lasts the whole day and you had to take it off every night and charge it, that seems like a lot of hassle for a watch. (I know it's not just a watch, but if you're going to use it as one.) Just curious.