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Hallo,

my idea is: render a small preview and see, at which SL the lighting and the noise is right and than approximate the full size render time.

For example: 25 % image size - SL 15 - 15 min. So, I could approximate how long a rendering in 100 % size need -> the render image area is 16 times bigger, so the render time 16 times longer => 4 hours. Is this right?

In my first test I have seen, that the real time is a little bit longer, but it could be good for approximations of big scale renderings.

I think, it should be possible to calculate the render time for a specific SL, if the rendering is some minutes or hours old. Could be good, if the MXI viewer could show the rendertime for a given SL per automatic calculation.

its a rule of 3 that apply here, if a 320 x 240 reach the appropriate quality sample lets say of 16 samples in 60 minutes it equals

320x240(the image size) : 76800 pixels rendered in 60 minutes that equal 3600 secondes so divide 76800 by 3600 that 'll give you the approximative pixel/second ratio of 21.3

so for a final render of lets say an A3 at 300 dpi

3508px X 4961px equal 17403188

then divide it by your average ratio ( 21.3) that give
817051.07 seconds
13617.517 minutes
226.95 hours
9.45 days

just do the math...
(hope its correct)