Corrected entry: Izzie tells the patient's mother if she doesn't want to be late for her 6:00pm job she needed to leave immediately as it is a 3 hour drive, when it is actually less than half that: 88 miles - 1 hour 20 minutes. There is only one route from Seattle to Chehalis, Interstate 5. The vast majority of the drive has speed limit of 65-70 MPH and at 3:00pm (or earlier) traffic will not be an issue.
Phixius
1st Oct 2014
Correction: Anybody that knows the area realises if you leave at 3 on a weekday, it will take 3 hours to go from Seattle to Chehalis. Google maps estimates anywhere from 2h to 3h 20m at that time of day, longer on a Friday, and she wouldn't want to take a chance on traffic being good, leave at 4, then be over an hour late for work.