US Postal Service CCA interview questions

Interview wasn't too long. It was a group interview. Most of the people included in my group were veterans (they get first dibs.) went over application to edit and add anything needed. filled out some paperwork. The interviewer asked questions about previous work experience and work conditions etc. the interview wasn't too long. Told us we would get a call within the next week if invited back

Applied on 4/5/16, drug and background email sent 4/11, drug testing done 4/16, interview on 4/25. im STILL waiting for an email regarding me starting. I scored a 79.10 on the 473 test. Maybe thats the hold up. Im not sure. Ive also been on the "pre hire" list on my usps profile. Can anyone give insight as to how long this process takes?????