You would definitely need network rendering, even consider a renderfarm! Overnight? Hmm, I don't think so!

Radiosity is a rendertime killer, I guess you already know that. In Vue, for outdoors, best is to use global illumination ( yes, Vue makes a difference here, GI in Vue is more an effect that produces and spreads realistic shadows, and radiosity is well, radiosity, with colour bleeding and all) Vue also has a lighting setting called global ambience, a less efficient GI, but not really like ambient occlusion either, that renders faster. Guess this is getting confusing, sorry.

Also, you will need a lot ( and I mean a lot) of anti aliasing if you intend to use wind on ecosystems in animations, in order to get rid of light flickering produced by GI on plants, another rendertime killer.

Animated water can be done various ways, either by animating water textures ( faster), or by creating a special procedural terrain on which you apply a water shader. procedural terrains are very realistic ( and especially for ocean effects), but they are, as you might've guessed already, another rendertime killer.

You will get very realistic and pleasing results with Vue, but overnight, hmmm....