Quote - Maybe posting a screencap of the settings will shed some light on what is going on.  Scene variations require careful assessment when creating render settings.  There is no one single combination that will work all the time.  In addition, mat room composition for each scene item might be overtaxing the render engine.  At times, simple shader combinations are better especially when objects are background fillers.

This.

My renders (which are usually 4k pixels on at least one side), take anywhere from 45 minutes to 9 hours. Most are about 2 hours. Lots of reflections and transparencies and a lot of super realistic shaders can take a long time to render. The best practice is to optimize your render settings for the particular scene you're doing.

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PoserPro 2014, PS CS5.5 Ext, Nikon D300. Win 8, i7-4770 @ 3.4 GHz, AMD Radeon 8570, 12 GB RAM.