How Long In Time To Drive A Car From Spokane Washington To Portland Oregon?

5.5 hrs with bathroom stops and gas stops

Well, I've done it in 8 hours and that's with stops for 2 meals, a cig break every couple of hours, and perhaps 4 or 5 bathroom breaks (I'm old).  I have friends who've accomplished it in considerably less time.  I'd say the average is between 5 - 8 hours.  Also depend on your route to some extent, and the weather in the passes if you use them.  My daughter, Auntimaime, might know this better than I because she lived in Spokane and visited us in Vancouver, WA (across the river from Portland, OR) several more times than I drove in that direction.