Well let's see,
I did it twice in 13 hours from Sacramento to Snohomish (2 hrs north of Olympia) in a 2002 Explorer V-6, with a wife and 14 month old daughter (long pit stops), but cruising at 90 the rest of the time. Figure it should take the Gashole Gang about 10hrs, depending if there is any "GAS" shortages.
Be careful thru Rogue, OR - Damn near got nailed by one of Oregon's finest hidden in the median. Damn those Ford anti-lock brakes on the new Explorer sure work good! As do the seatbelts.
Got slowed from 95 to 65 before he could nail me.
David