Got iEAD from Charlotte NC
got there @6:30, about 25 people already there. Officer started calling for ones who has a apointment @7:00. @ 7:30 the they start give tickets. arountd 8:15 my name was called and the lady asked for I485 receipt notice, EAD receipt notice and newly filled EAD application form. Since my I-485 documents are transfered there, they went back to check all the files. It took them about 45 min. Then they asked me back @2:00 PM. (for the one whose files are in texas, I believe they do not do that. They let you come back @2PM.) They started take pictures and issue after 2:30. only about 15 people need EAD. It should not have taken a lot time, but their computer was broke after a couple of EAD issued. It take them a about an hour to fix. I left there @4:00.
suggestion: If you go for EAD in Charlotte office , you do not need to go early. No matter how early you go, they wait to the last to issue EAD or any other card need to take a picture. I believe you may get there @11:00 and still safe. They will stop issue tickets @12:00.