How difficult will it be to buy an IPhone 5s in store on launch day?

If I want to get the IPhone 5s from the AT&T store the day it comes out, how early should I show up at the doors to get one? The store opens at 9:00. How long do you think it would take them to sell out? I want a gold, 32 GB if that makes a difference.

It's doubtful that they will sell out, but I would highly recommend buying it online. And I recommend showing up 1-2 hours early

If you go to apple store you will probably get it, I would bet other stores are sold out as the preorders alone would consume all of it.