This is the entire scene.  Not bad, but...
----------------------------------------------------------------------------
Radiosity samples calculated:    1739302 (25.10 percent)
Radiosity samples reused:        5191566
----------------------------------------------------------------------------
Time For Parse:    0 hours  1 minutes  27.0 seconds (87 seconds)
Time For Trace:    3 hours 54 minutes  14.0 seconds (13811 seconds)
    Total Time:    3 hours 51 minutes  38.0 seconds (13898 seconds)
----------------------------------------------------------------------------

It seemed to scream down through the sky area in under 3 minutes, and when
it hit the grass, it went down to about 30pps



I used these rad settings.

global_settings {
 assumed_gamma 0.8
 ambient_light rgb .5

    radiosity {
      pretrace_start 0.08
      pretrace_end   0.01
      count 30

      nearest_count 10
      error_bound 0.5
      recursion_limit 1

      low_error_factor 1
      gray_threshold 0.0
      minimum_reuse 0.015
      brightness 1

      adc_bailout 0.01/2
    }
 max_trace_level 3
}

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