Hi,
I wouldn't even know where to find Riven materials, if any were available. I used textures from my library. No, nothing in this model is exact to Riven's "Tay".
Render time on my computer running 2 threads (system specs below) for a 800x600 animation of roughly 250 frames is 30 minutes. Render time for a still 1280x1024 image is about 1 minute 30 seconds.
Getting an optimized build from www.graphicall.org always helps too.
Cheerio,
John