Well, all I know is that I have unpublished a hub and kept it unpublished for a long period of time (not sure about 3 months), but then published it again. I think as long as it is unpublished, you can publish it when you get ready. Not really sure if there is a time limit on unpublished hubs. But you cannot republish a hub if it is on another site still, after your contests are over and done with. I am not sure if I answered your question correctly or not. Sorry.
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