If you tell me the (e.g., modern, classic, dark/moody) or your current V-Ray version , I can recommend the exact settings to use. Settings - V-Ray for SketchUp - Chaos Docs
If you are a professional interior designer billing hourly, buy a premium "VROPT Interior New Download" pack. The time saved on the first render pays for the file.
to test specific materials or lighting in small chunks before committing to a full render. SketchUp Community Convert Free Make Model to Pro Solids - SketchUp Forum