[Jens Tellmann]

Thanks lot for replying!

Min/Max Resolution and Stochastic Samples are as low as possible.

Right now the final render (31,5cm X 29,7 cm at 300dpi) is running and I am at 13:10 hours and not even a quarter of the image is done.
I guess I have to figure out later, what the problem was.
Unfortunately I don’t have the time to take chances.
If I spend too much time on troubleshooting with no satisyfying result, im in hot water with my production deadline.

But thanks for your help anyway.

Excellent forum, btw.
Very helpful!