Matthias,
I already answered you by e-mail on september 29...
Perhaps you did not receive the answer. So here it is again, below.
Fred
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Each scene requires a different SL to get rid of most of the noise, so it is impossible for us to say when your scene will look "good". Also "good" means different things to different people) No noise at all? A reasonable amount of noise? (but then what is "reasonable"...)
You can use our cost estimator here (
http://www.ranchcomputing.com/M_estimateur_cout_uk.php) to evaluate the cost. For instance if you specify a two hours (120 mn) render limit at 2500 x 1875 with a preparation time of 1 minute and no multilight it should cost you around $167.
I suggest you do the following test: render your scene on your system for 15 minutes and note the SL reached. Then send us your scene with a render time limit of 15 minutes. It should cost you less than $30 (with no multilight) and you will be able to see the difference in SL between your system and the farm. Then you will be able to apply this difference to other projects.
UPDATE: I recently added comparison figures to the cost estimator which should help you. Since you have a Q6600, you can see that if you get a sampling level of 'SL' on your machine in N minutes, you will get a 'SL+6.59' (approximately) on the Ranch in the same amount of time.
And - very important - please read the Renderfarm User Guide thoroughly before sending anything.