How often to increase goal for steps walked?

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Hey guys,
I've been wearing a pedometer pretty regularly for a few weeks, I went from the initial goal of 1500, to 3000 now and I seem to be meeting and at least going over a little bit each day. I was just wondering how far those of you that wear pedometers walk, and when you increase your steps goal.
Thanks everyone! Hope you're having a great evening.
-Sarah