That is something that Epic is looking to improve–one thing is getting your scenes to UE4 quickly so they are working on a plugin for 3ds Max that can send over a full scene and convert your materials. You can sign up for the beta here: http://unrealengine.com/beta
The other biggest challenge is the lighting, making lightmap UV’s is a big hassle for archviz and you still have to build the lighting so you likely have to get it to render overnight though when it’s done you can do animations very quick and that’s a better option than waiting days for a single shot to render with Vray.
You may want to look into Nvidia VXGI which is a fully dynamic GI system, it’s not going to give as good of results as baked lighting, but it’s very quick and can give acceptable results for some cases. It requires building the source code to do that however: NVIDIA GameWorks Integration - Asset Creation - Epic Developer Community Forums