There's no expiration date for the pictures sitting on the server. As long as a random server glitch doesn't try to each your files, it can last indefinitely. I've personally tested over a month of waiting, and some other people mentioned staying put for a few months without any side effects. The only downside is that you can't submit any other pic while you've got one underway!
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"There are only three things certain in life: Death, taxes, and Teej's obsessions." ~ RisingDragon