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18 minute Matzah?

Are there sources EXPLAINING why we have to make matzah within 18 minutes? I understand having a time limit if in fact the reason we eat matzah is to reenact the speed which we left Egypt (that explination is questionable as we ate matzah in Mitzraim anyway, but that is food for another question) But why 18 minutes, it seems a bit like an arbitrary number.