Excellent works!!

6 hours? Geez. Of course, the extreme size could have something to do with it. Why does it have to be so big? It looks nice at 8" x 2" (approx) on the Newgrounds page, but I can't get a good view of it because if I bring it up to full size, it's so massively outside the size of my screen that I can't appreciate any of it. How about 1375x437 (one fifth scale) or 2291x728 (one third scale)? It would also help the file size. I never thought I'd see a file size that huge! 17.8 mb is so massive that it's actually slowing Newgrounds as I type this. I type and then look up and only then do the letters show up on the screen.

It looks nice! I like it. But it's just too massive.

That shouldn't have taken 6 hours. I think that you need to go through all your surfaces and tell them only to render one pass' worth of reflections. In Blender, for example, you can change a setting called "depth" under the Ray Mirror options. If you set "depth" to 1 on object A and on object B, then you will see a reflection of B on A and a reflection of A on B. But you won't see A's reflection on B's reflection on A.

Let's make that clearer: when you stand between two mirrors in real life, you can see yourself many times. The "depth" setting cuts that off; if you stood between two mirrors each with "depth" 1, then you would still see your reflection in each mirror, and you'd see the left mirror reflected in the right mirror. But, you would NOT see the right mirror's reflection of you in the left mirror. There would only be two total reflections of you: one left and one right. Increase "depth" to 2, and there would be four total reflections of you, two left and two right, because each mirror is reflecting the other mirror's reflection. I don't know what program you are using, but find that setting and see if you can turn it down and decrease your render time without ruining the image.

Now for the advice I've give to almost every 3D artist here on NewGrounds: BEVEL YOUR EDGES. That is the first clue that an object was made on a computer, because edges in real life just aren't that sharp, particularly at 6874 x 2184.

But your textures are awesome and once you get it more efficient, your use of ray-tracing is excellent!