That’s a very good number; so a single plot on an i7-3960x is 6.6 hours? Considering it’s a 3rd gen Sandy Bridge circa 2011 that’s very good. This does lend credence to the theory that going back pretty far in Intel generations doesn’t hurt you very much; it’s all about cores … cc @instrumentality
Unfortunately Intel was very very stingy on cores until AMD came along and kicked their ass 
on that front … more cores for the people … which was well deserved! Hit 'em right in the Xeon jewels, where it really hurts. That and ECC for everyone!