We went on a Saturday in August, leaving Disney around noon and didn't get there until 3! We did stop for lunch for 30 minutes so a 2.5 hour trip. The traffic was insane! I forget the road (whatever the big freeway is).
Our ride back to LAX on Monday, leaving at 5 pm, only took 1 hr, 20 minutes. ( I thought it would be worse)
I was a little stressed because we had never driven in LA before (we are from Long Island and have our own issues with traffic but nothing compares to LA traffic).