You'd have to use a hollow box container,
but make sure you have no coincident surfaces
with the actual room itself.

Then you'd use
interior{media{scattering{X,Y} intervals A samples 1,B method C}}

where X is the scattering-type (I guess 3 or 4 would do fine),
Y is the rgb-amount of scattering (which is somewhat dependant
on your lightsources, and how thick the dust should be)
Intervals and Samples are typical media-settings, and I'd
say you should use at least 20 intervals with 1 to 20 samples
to begin with. In that case, don't forget to use method 2. Method
2 would be best in any case, since method 3 doesn't work too
good for such situations as the one you are in, and method
1 is too grainy.

Hope that helps a bit.

(PS: Overnight might not suffice, you know...)

--
Tim Nikias
Homepage: http://www.digitaltwilight.de/no_lights/index.html

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