I'm finding the render times are much longer in 7.  I just set up a simple scene with jsut a few trees couple of terrains and a boat.
OK so I have godrays on but it's telling me it's going to take 7+ hours and that's only on at 'final' quality.

Similar scene in 6 would have been much quicker.

I love all the new goodies but I'm finding these render times a right royal PITA 

Gill