I can make most things out from the preview window. I don't see anything that sticks out as a big processor user. Are any of your bark textures really busy? I mean when you open the material editor are you using multiple channels and three or four material sets? Unless you are planning on zooming the camera across the lake you can render the whole far side of the shore and put it on a flat plane instead of the current 3D version. When your processor goes to calculate the light rays it will be bouncing rays off flat surface instead of round trunks and through leaves. Your times should drop if you do that. Looks like only natural sunlight in your scene. If you stuck lights in the mushrooms to make them glow take them out. Instead use the diffusion and ambience set high. When the total values are greater than 100 objects appear to give off more light than they take in. You are rendering large files. I'm guessing the video will come in at about 10mb/minute at 15fps using mpeg4 codex2 at about 85%. Quicktime would be about 4 to 5 times that and it will not like the odd aspect ratio you have chosen for the screen size. I tried a landscape scene with the window scaled and premium renders set as you describe. I'm running a Pentium 4 2.4GHz on a 100 bus with 1gig memory. A single frame on my machine takes 1h 58m 32s to render. At 15fps it will take 5 hours 38min to do a second of video. One minute will take 14 days 20 minutes to render. If you drop your rays back to 64 it will take a quarter of that. Whatever you do I suggest you render video with default no AA settings. You can make sure you dont walk the camera or object through an object or into the ground.