Knowing a little about how Dmoz works, I would not submit all of them at the same time - maybe do 1 a week or so, which may sound time consuming, but with the rates that they review over there, odds are you'll get a reviewer doing weeks of submits all in the same sitting & if they see 30 sites from you in the same hour, odds are they will get tired of seeing you.
I still throw all my free sites into dmoz in hopes that they'll get reviewed & listed, but I do it as I'm building & submitting them so that dmoz doesn't get any sicker of me.
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