Nvm the presets, they work now... I don't know why I had problems with them.
Here are my specs:
Intel Pentium 4 Prescott (800kb cash) 2.6GHz
1 GB RAM DDR 400MHz
ATI Radeon 9550 256MB (AGP 8X)
Windows XP sp2

Don't know what else could be relevant...

Here are my render settings for the 2h 8m render:


Anything you think I need to lower/raise or turn on/of etc. to improve the quality/performance ratio?
I've also got two more questions about MR:
*What does 'Acceleration' under Raytracing do?
*What does the primary framebuffer do? Especially 'Data type'.

Here's a test render with low quality that took 16m:

presets make life much easier

Benny