Oops, a pretty important thing to note:  Transparency takes gobs and gobs of time to calculate with Indirect Lighting enabled.  This isn't really unique to Poser, it happens in other apps that render with Global Illumination too.  A crappy workaround is to just make stuff like hair invisible to raytracing.  It's not ideal because this stops hair from casting shadows, but it's better than waiting a week for your render to finish.  The more complex the geometry of a semi-transparent model, the worse this is; some very simple hair models may be tolerable to render without this workaround, e.g. Kozaburo's.

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