I use the same render engine but there are little tricks to cut the render time a bit, like setting the global illumination to low-low instead of medium or high. As a result you get almost a half of the original render time and you won't notice any difference. Or make things bigger so you can decrease the ambient occlusion's accuracy... With that kind of lil' tips I rendered this
[link] in like 15 minutes, wich is not that bad imo.