Interesting. I have a very similar scene that I can render in just an 
hour or two (on one core of my laptop's Centrino) that uses the 
following media:

box {
         <-20, -07, -7.9>, <20, 20, 5>
         pigment {color rgbt 01.}
         hollow
         interior {
                 media {
                         scattering {
                                 1, 0.1
                                 extinction 0.5
                         }
                         samples 300, 10000
                 }
         }
}

No extinction (too fiddly for me, honestly) and no intervals--I need to 
re-red the docs on what intervals does.

I had some short trees that cast lots of light rays down below the 
horizon line, and I couldn't make those light rays look quite right to 
me without cranking the samples way up.

-- 
William Tracy
afi### [at] gmailcom -- wtr### [at] calpolyedu

I disapprove of what you say, but I will defend to the death your right 
to say it.
     -- Evelyn Beatrice Hall, frequently mis-attributed to Voltaire

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