Yes, it would really take about 90 minutes, traffic or no traffic, just because the cities are very far apart. I posted in another thread about the Amtrak "San Joaquin" train if you want an alternative to spending 15+ hours a week behind the wheel of a car, but here is the schedule again:
http://www.amtrak.com/timetable/oct08/W33.pdf
Of course, if you're going to use this option, it helps if you live close to the Amtrak station, or the "Gold Line" light rail line (which goes straight to the Amtrak station.)