I live just North of
Disneyland and commute daily to near the airport. My drive is primarily on the 91 W and then surface streets (unless there's low traffic I'll avoid the 405 even in the HOV lane). I actually leave later than most but get there near to when you want to arrive (I nominally get to work between 8:30 and 9). My drive is maybe 5-10 minutes shorter than your drive. To get to work by 9 (I'm in the carpool lane as I'm assuming you'd be), I have to leave NLT 7:30. As long as you're in the car by 7:30, you'll be fine. If you're the nervous type, you can leave at 7:15. However, the caveat is that there is no major sigalert (incident). Check w/ Google Maps or Waze during your drive to make sure something severe didn't happen (although if something happens on your route less than 15 minutes before you get there, you're stuck).