This is nuts. I would not want to spend this much time in coach and it is a vacation run as you must stay a bunch of days in Hong Kong! But the numbers are just a crazy. You can, via this FT thread, look at a bunch of starting airports and drive the price well below 4CPM and get a stupid amount of Skymiles on top of the MQMs. Here are the numbers from MIA!
19,447 MQMs at 3.45 CPM
Bookable on Delta.com
Be sure to use this switch to search Matrix: dl+ /f bc=v
DM yields a HUGE 43,757 Skymiles per CWSI.net!
Again, I am still complaining about my 8-9 hours in coach each way on my last run. This would be WOW and be sure you count the hotel costs as well! Short of some medallion level? This could sure put you over the top.
EDIT: There seems to be MANY more cities you can use so search near your home town too!