I am still waiting here to see a comment or a responds from developers side,especially from Emmanuel Puybaret. 
I already gave you my answer some time ago:
Not sure it' a good idea to invest more time in SunFlow which is not maintained by its main developer anymore.
Sorry 
The scene took 1Hr 20Mins for rendering in sunflow
I just can't imagine how long it would take for a real Sweet Home 3D scene!!!----------------------------------------
Emmanuel Puybaret, Sweet Home 3D creator
