Let me at least be clear what I mean by "literal". I think the millennium is literal in the sense that there really will be an earthly kingdom ruled by Jesus on earth in the future. I don't think the millennium is figurative for the interadvent period. However, the "thousand years" may be not literally 1000 years (maybe it's 999 or 1001 or maybe its 1245 years and 234 days). When writers criticize premillennialsm they can sometimes blur this important distinction. Sure, the millennium my not be 1000x365 days, but that is not to say that the only alternative is to say the millennium is the interadvent period. I argued againt such an interpretation in my post.