I made a new test, with the lights of lamps active.
PT, 12000 maxsamples, 10 maxdepth, 2400x1800, 8.40h .. and the noise is still a lot.
Also I do not understand the distortion that causes the glass.
Here are some screenshots on the material and the geometry used.
To solved the distortion, should I use a solid rather than 2 plane?
i7 970 3.3 GHz | 12Gb Ram | GTx550Ti for display + Gainward GTX580 1.5 Gb and Zotac 590 3 Gb for Octane | Win7 x64 __ Softimage 2011.5