Here's the render from my river model tests.
Detail 1, AA 6, GI 2, 4 Render time: 93h 45m (had to let it keep going to see what it looked like)
fov 90°
The terrain has only very basic surfacing and the wave size needed some tweakng, but I love the wind patch effect in TG2. The only area of water that's of a little concern to me is the shallow water on the bottom right, but then I haven't done any shore effects which will change this a bit. A little post sharpening in Photoshop.