Motion blur doesn't usually drive my render times up that much unless I have a lot of objects moving (and I mean a lot) with excessive amounts of Motion Blur (75 to 100%). Even then it never turns a six minute render into a 4 hour render. Motion Blur + Depth of Field + Refraction + Reflection + 4+ raytrace bounces + 0.21 minimum shading + well you get the idea...that drives up my render times.  Heck, some of the scenes I been rendering at HD 4 hours would be a blessing, day and a half per frame (of course emy fastest render machine is only quad core with 4gb ram).  Before asking how I can stand day and a half render times, let me just point out I started in 3D when processor speeds were 40mhz (yes, mhz) ;)

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