Wipe, your post prompted me to do a test. I ran a 12,000 x 12,000 pixel render in Poser Pro last night - a simple background, 1 V4 character - which ran and completed with no problems; I'm guessing an 8-hour render time.

I've set up a more complex scene at 15K x 15K but I'll let that run over the weekend.

Incidentally, at this resolution, if your figure more or less fills the scene, you start to see all sorts of little glitches (JPEG artifacts, texture stretching, node noise and so on) that wouldn't be apparent on 'normal' renders.

The last time I needed a really big render (6K x 8K) I did it in Vue, and it completed in under 2 hours.

Do you really need to render that large? If you're trying to hit 300ppi for printing, you probably don't. Aim for 200ppi instead - the printed results will be virtually the same.

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Windows 10 x64 Pro - Intel Xeon E5450 @ 3.00GHz (x2)

PoserPro 11 - Units: Metres

Adobe CC 2017