the are tiny details like a zip but I don´t think that this is the problem
I did a lot of test, getting rid of details and solidify modifier for example but the time is almost the same.
For the lighting a use 1 pass for the difuse and another for shading… but I dont know where is the problem
The difuse pass and the compositing for shading takes just 17 seconds… .
The final result is awesome to me but I can´t believe that it takes 14 minutes for render just one frame.
I’m not an expert, but I also had these warnings, and there were no duplicated meshes or double vertices, and the result was fine anyway; I think it simply finds that the same edges belong to different line sets at the same time, but it’s a mere supposition.
As for the long rendering time, Freestyle is like that… perhaps you have some particle hair in the scene?