It can take up to a couple weeks, but the norm is less than a week.  We have to consider these factors when making the publish or no publish decision:

   * Sellability: Will anyone buy it?

   * Design quality: Is it clean or does it have jagged edges?  is it the right size?

   * Uniqueness: Do we already have similar designs on the site?

We also like to "space out" our publishing schedule to keep the first page of the catalog fresh and interesting.  If it has been more than two weeks and you want some feedback you can contact us about your submission.