The code is in povray.text.scene-files. Take this as a work in progress. 
I think some parameters need readjustments.

Intel® Core™ i7-3770 CPU @ 3.40GHz × 8
RAM 7,7 GiB
OS Ubuntu 18.04.1 LTS

Render Time:
   Photon Time:      No photons
   Radiosity Time:   0 hours 24 minutes  1 seconds (1441.334 seconds)
               using 8 thread(s) with 11340.966 CPU-seconds total
   Trace Time:       6 hours  1 minutes 38 seconds (21698.912 seconds)
               using 8 thread(s) with 172774.191 CPU-seconds total

Regards
BGimeno

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