I initially started with a 300+ frame animation using La Femme and OptiX High was rendering about 15 frames PER MINUTE, or 4 seconds apiece.

Then I replaced La Femme with the default V4 model, using the same animation. Since I don't have many animated poses, I had to use a couple of Sydney G2 poses, which aren't all that great. That's why I am saying that YOU have to do the comparison yourself, because we will not be able to exactly reproduce your textures and animations and hardware. 

Anyway, using V4 as the model, I am getting roughly 22 frames PER MINUTE on Optix High render. Or, less than 3 seconds PER FRAME.This is using the same render dimensions as your first animated GIF.

So roughly 10-15 minutes for the whole thing.  Not the 100 hours you predicted.

Now YOU try it.