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1.1. Open the scene.

1.2. Assign V-Ray as the current renderer.

1.3. Check the Override mtl option in the Global switches rollout, click the button next to it, and select a default VRayMtl material. This way, you can start with a fast preview render.

1.4. Keep the resolution small (640x480) at this first step in order to save render time, while making changes to the scene.

1.5. Render the scene.

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2.1. Since the scene looks too dark, let's brighten it a bit. There are several ways to do this. One is to increase the power of the lights. However, this will make the directly lit areas of the image, like the patch of sunlight, too bright, while indirectly lit regions will remain relatively dark. Once the materials are applied to the scene, it will brighten it up considerably.

2.2. In this case, you can make the override material brighter. Go to the Material Editor and put the default VRayMtl in one of the slots (it shows up as being used in the "Environment" in the Material/Maps browser). Make the Diffuse color of the material RGB (200, 200, 200).

2.3. Let's also explore the balance between noise and render time. For starters, set the Render time (min) to 0.0, that is, no limit in time. This way V-Ray will continue rendering until either the Noise threshold is reached or until the Max. subdivs are reached. Now, let's start with a high value for the Noise Threshold, something like 0.1.

2.4. Render.

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