24 hours till departure

I cannot believe the time is already here for me to leave! I have spent the past two days packing and weighing my luggage religiously :) How does a girl back for 4 months? My plane departs at 1 pm tomorrow but I have to be at the airport no later than 9:30 to get through customs, security and exhange some money. I fly from Atlanta to D.C. Next I have a 19 hour flight from D.C. to Johannesburg. Finally I fly a short flight from Johannesburg to Port Elizbeth. That's a whopping 23 hours in a plane! Wish me luck!