I just set it to 12000 samples per pixel, because i wanted to see if that makes much of a difference.
It didnt change very much after 3000 though. That means i could have left it render for just 20 minutes and it would have looked almost the same.
But i never rendered anything with 12000 samples per pixel before
With CPU-Raytracers i just didn´t have the time to try things like that.
I am really looking forward to MLT since that will cut rendertimes even further.