You really don't need to worry about charging it that much. The battery lasts an incredibly long time, and even when it's very low the device stops tracking everything and only tracks step counts. I went on a two week vacation and was fine when I came back.
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I charge mine at home, once a week, when I'm in the shower. It's always fully charged by the time I am done dressing and all that.
Yeah, I usually charge it at my desk during the day when I'm at the office. It doesn't take too long to get to a full charge (maybe 30 minutes?).
One way that I plan on charging it (I haven't had to yet) is putting it in it's docking station while I am sitting sedentary at my desk in the office. That is the only place that I can think to do it.