vray test render settings

hi po. 3 weeks ago lang po ako nagsimula ng 3ds max and just 2 days ago ako nagsimula gumamit ng vray. can you guys give tips on settings to make a test render finish faster? this is just a still and its a car kaso lang ang tagal magrender kahit ang gusto ko lang ay test render at hindi ang final para makagawa pa ako ng mga edits ayon sa nakikita ko sa test render. 5 hours na nagrerender pero nasa 2 of 4 prepass pa. thank you po in advance.

just take a look here sir
http://www.cgpinoy.org/vray-for-3d-studio-max-tutorials-f35/share-your-vray-settings-here-t270.htm?highlight=render+settings

thank you kind sir.