Render an image as big as you want, but be prepared, it could take a while.

Designed for a large poster print to be framed (65" x ~28"). There's a mirror in front of you and a mirror behind you, so you stare down an infinite tunnel. I would have enabled higher levels of trace recursion, since the tunnel can't really be infinite, and you can see where it ends (see bottom image), but this took long enough as it is...

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Bounding boxes.......On  Bounding threshold: 3 
  Light Buffer.........On  Vista Buffer.........On  Draw Vista Buffer...Off
  Antialiasing.........On  (Method 1, Threshold 0.050, Depth 4, Jitter 0.05)
Animation Options
  Clock value....   0.000  (Animation off)
Redirecting Options
  All Streams to console..........On
  Debug Stream to console.........On
  Fatal Stream to console.........On
  Render Stream to console........On
  Statistics Stream to console....On
  Warning Stream to console.......On

SSE2 detected - using SSE2 optimizations

Scene contains 325 frame level objects; 0 infinite.

Statistics for supercube bw_2.pov, Resolution 12000 x 5333
----------------------------------------------------------------------------
Pixels:        64008000   Samples:       971144256   Smpls/Pxl: 15.17
Rays:       20394017250   Saved:                 0   Max Level: 20/20
----------------------------------------------------------------------------
Ray->Shape Intersection          Tests       Succeeded  Percentage
----------------------------------------------------------------------------
Box                        19422872993     19422872272    100.00
Cone/Cylinder              48936420989     24281075956     49.62
Superellipsoid             48862160851     25000648628     51.17
Bounding Box             1488859569257    371880092352     24.98
Light Buffer             3536641101318   1039402680663     29.39
Vista Buffer               24715044302     11214484770     45.38
----------------------------------------------------------------------------
Calls to Noise:                  0   Calls to DNoise:             10
----------------------------------------------------------------------------
Shadow Ray Tests:      49349484822   Succeeded:          31723202773
Reflected Rays:        19422872994
----------------------------------------------------------------------------
Smallest Alloc:                 25 bytes   Largest:           240044
Peak memory used:          1380861 bytes
----------------------------------------------------------------------------
Time For Trace:  316 hours 54 minutes  53.0 seconds (1140893 seconds)
    Total Time:  316 hours 54 minutes  53.0 seconds (1140893 seconds)
----------------------------------------------------------------------------
CPU time used: kernel 154.03 seconds, user 1105622.56 seconds, total 1105776.59 seconds
Render averaged 57.87 PPS over 63996000 pixels

POV-Ray finished

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That's about 13 days (2.4 Ghz P4 CPU).

Inset 1 (actual size), now that I cropped this out I can't find where it came from.

Inset 2 (actual size), located about 50% from the top to the bottom; about 25% from the left to the right in the original image).