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I am wondering if in the end it will clear up.
now , after 24,etc hour we are at 16,1 sl
windows before the patio are without glass

Yes, it will clear up. Eventually. How long? That's the question.

Again here is another scene where the majority of the scene lighting seems to be indirect sunlight. Although you have some emitters, they don't seem to be contributing much to the overall lighting level. Use fill lights where possible, to speed things up. Also, you can get very good sunlight from HDRI, which might also speed up the rendering.

BTW, the rendering is looking good!

If you must use this kind of lighting setup, I suggest to look at the cost/time savings of a renderfarm.

fill light...uhmmm
where and how to place them? how big?
for instance a light plane before the patio windows as large as them would be ok?

That's up to you. Think like a photographer.

ok.. are there some general rules to be followed ? or a overall strategy?

Do you have ML on? You could check by turning on/off each emitter which ones are creating most of the noise. Perhaps most is coming from the round ceiling lights. How are they created? Are they inside a metal container?

@ Mihai: It's too tempting not to ask back. Should you NOT put emitters inside a metal container?

I think the most efficient can would be a black difuse object (roughness 100). I remember a post by Tom where he tested this.

Fernando Tella wrote:I think the most efficient can would be a black difuse object (roughness 100). I remember a post by Tom where he tested this.

But it also affects the look of the reflected caustics on adjacent surfaces.