Citizenship

I just discovered this website and think it is very helpful. Is anybody here that just attended a ceremony, or know a friend that just attended a ceremony. I tried to send an email to Immidragon but his email does not work. I am attending the ceremony on May 22 at 9:00am at masonic center. I would like to ask a question about how much time it actually takes for the whole ceremony (starting at 9:00am). The reason is that I will have to catch a plane departure at 1:15pm that same day after the ceremony. Immidragon did mention that it took about 1 hr and 15 mins, is that the time for the ceremony or the time between 9:00am and when the ceremony finished. I wonder if it started at sharp 9:00am, or whatever time the all the people scheduled for the oath arrived.
I will try not to reschedule for the oath, as there is possibility of turning certainty to uncertainty. It is also painful to change my travel schedule which was set before I got the oath notice. I would really appreciate it if anybody could let me know.