I've had EE start laying at 17 weeks, I've had a few that took 9 months. Each chicken is an individual, you can never be sure what they will do.
Some EE flocks start laying fairly young on average, some may not lay until they are a little older. If you know when the flock your EE's came from started laying and you have enough of them for averages to mean anything you can get a good idea when you might get your first egg.
The combs and wattles getting red is a great sign they may be close. I personally do not put much faith in the squatting, I've seen that not mean anything a few times. I don't know why them being skittish would mean anything.
I understand the frustration and excitement. The odds are you will see an egg before too long with the combs and wattles turning red so hang in there. I don't think you are going to have to wait 9 months, trust me. that is really frustrating.