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how is that even possible also I have been waiting for a render with multiple(8) models to render more than an hour has passed it still at 60%
Wow...
Here are some of my suggestions.
If these are figures that are present in both Gen3 and Gen8, why not use Gen3 for unimportant events. Render will go much quicker.
Or, render 4 alone and switch off anything else. Merge them later via your favorite graphical app.
There are several ways to do that.
If you add lots of figures with high sub-d, it will take longer to render. Plus if you closer to the models. The closer, the longer because of details.
Just my personal opinion though.
Some assets prolong the render process because of their textures. So you can try to lower the quality of them. Perhaps reduce reflectivity and glossiness.
Or take the ceiling off, maybe some walls that aren't visible.
Also, use a Iray Cam as i mostly do.