I think there's a rule against using the DT acronym for anything but Dream Theater on a Dream Theater forum.
So, I was rendering a shot overnight for ~9 hours (with about 7-8 hours left to go), only to find i accidentally left an object visible in the background that I shouldn't have (it was invisible when I rendered it, but it showed up when I stuck a background behind it), so that was all wasted time.
But I realized that I didn't need to render it at full HD and could get away with 1600x900 easily, so at least the re-render will only take 13 hours instead of 17ish. So that's something, I guess....