I thought I'd give Jadzia's image a try.  I did include a mirror: a 
glass plate with aluminum backing.

Elapsed time was 15.5 hours.  Here are some stats:

Number of photons shot:        78466522
Surface photons stored:         1060010
Gather function called:        51789326

Render Time:
   Photon Time:     11 hours 34 minutes 58 seconds (41698.012 seconds)
               using 11 thread(s) with 164250.003 CPU-seconds total
   Radiosity Time:   0 hours  4 minutes  2 seconds (242.569 seconds)
               using 8 thread(s) with 1918.047 CPU-seconds total
   Trace Time:       3 hours 51 minutes 53 seconds (13913.227 seconds)
               using 8 thread(s) with 108057.917 CPU-seconds total

Most of that time was photons interacting with the mirror, and that even 
by using photons { target 5 }.  Based on draft runs, I estimate that 
about 10 of the 11.6 photons hours was just the mirror.  But some 
caustics from the mirror are visible on the walls, so I kept the mirror 
as a photons target.

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