20 week appt

My 20 week appointment is on Friday! What should I expect? I know the anatomy scan will be done. I already know I'm having a girl, I've known for almost 2 months so they won't have to reveal the gender to me. Anything else to expect? Is this appointment typically long? I'm asking the question about the length of time because my husband and I have to catch a flight a few hours after the appointment lol.