Pre orders.

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When you pre order something, doesn't matter if it is on the internet or not, how long do you think is a long enough time to wait before you change your mind? Reason I am asking is I recently pre ordered something from the internet, and was told delivery would be within 2-3 weeks after payment. Well here I am sitting on day 40 so far and nothing. I have been told that my items are being shipped today, but then again no word. Thoughts?