I made this a long time ago, I don't remember. But I'm sure it was huge because those clouds and those rays are killers. In these situations I normally render while I'm at work or sleeping. When I have time to play with Vue, I stop render, save the scene and play with other scenes. Then, before going to bed or to work, I resume the render again. So, basically it renders only during the idle times. I think my sanity is ensured.