It is 1,179.50 miles and an estimated 18 hours and 20 minutes of driving time according to MapQuest.
time
about 4 hours including the border
about 1:45
About four hours, inlcuding the border crossing.
It is 172.88 miles. it takes 3 hours to drive from Portland OR to Seattle. :)
4 days
It takes about 11 to 12 hours to get to Reno from Seattle.
2days
Google Maps estimates the driving time as 15 hours and 19 Minutes.
From Billings and Seattle it is 819 mi (about 11 hours 37 mins).
13 Hours
Around 48 hours nonstop.