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If memory serves, Paolo didn't have the actual render time for the picture you are referring to. The guy who rendered it didn't write it down, but gave a ballpark later in that thread. I just know everyone who knows about unbiased rendering just shook their head and did a face palm when it came up. ;)
 

Kevin

As the person who did the car render in question I can tell you off the top of my head that the render was stoped after 7 hours.  I did watch it for the first two hours and have the two hour version and can tell you its really good but has more noise then the 7 hour.  I only let it go to 7 cause I went to bed and wanted to see what a few more hours would do to it.

I repositioned the sun later and rendered again and this time stopped it at 15 min.  You can see the 15 min version with the differnt lighting here: http://forum.daz3d.com/viewtopic.php?p=2494964#2494964