I made this test to check the performance of the CPU and RAM...
it took me 15 hr and 48 mins......
Resolution : 1500*860 Tiff
No HDRI, just spherical environment.
Dome light (60 omni lights) was used.
2 extra spot lights and 1 rect planar light.
Ambient light turned off.
Reflection iteration: 3
Refraction iteration: 2
AA - High 4X
Mesh - Smooth and slower
Shadow - Soft Shadow
Flamingo is pretty good for product design as it works perfect with Rhino ( they are both very economic ) but the rendering speed is frustrating......no real caustic, no HDRI, no GI, no channel rendering.......