Traffic is horrible at all times on the five freeway. I say an hour and a half is realistic, you can only get there in an hour early morning or late night. I also suggest spending two days at disneyland. Three days if you go to california adventure.
I work in Irvine and know of one guy who commutes from Carlsbad - about 45+ minutes in the morning. From Irvine to Anaheim will be another 25 (low traffic) to 45+ minutes (rush hour). You usually won't hit too much traffic from Carlsbad north on the 5 until you hit Irvine area.
Is that control station ever open any more? Seems to me that every time we have recently gone through there it's closed. Last time, it looked like a big parking lot for the ICE cars, but no human activity?