During the morning and afternoon rush hours - it could be as long as 1.5 to two hours. If traffic flows smoothly, then it is a little over an hour - the problem is that there are two many places for it not to flow smoothly. The biggest trouble spot is still the I-5 - US 16 interchange right by the Tacoma Mall. If there are any problems there or coming up or down the Tacoma Hill by 38th Street, it will be 1.5 hours, at least.
Depends on what part of Seattle you re leaving from, the time of day/traffic, etc.... but generally it s a about 1 hour and 10 minutes, for the 61 mile drive.
usually about an hour or a little longer depending on traffic flow??