H1B, H4 Visa

Hi
    I have been following this forum and wanted to share my experience here and also looking for any suggestions or opinions on the same.
Interview date: 8 Dec 2017
Questions asked:
VO: Good morning
Me: Good morning. How r u doing?
VO: Good. Thanks
VO: Did u hold any other visa before h1?
Me: Yes, I was on F1 before.
VO: Can I have ur I797
Me: Yes, here it is.
VO: which uni did u go to there:
Me: told the uni name
VO: who is ur employer?
Me:Xxxxx
VO: how many employees work there?
Me: xxxx
VO: do u have a client?
Me: yes I do.xxxx
VO: do u have a client letter?
Me: yes I do
VO: ok can I have a look at it? And also can u say what does ur client do?
Me: gave the letter n gave a brief description of the client.
VO: ok, I am keeping ur passport but there is a routine administration processing that would require 3 days. It can also take upto a week but it should take more time.
Me: can I know if it could go more than that cause i have my return trip planned which is next week
VO: It shouldnt take more time.
Me: ok thanks.

I dont know y is it taking that long. I have read in the forum that many people converting from f1 to h1 are experiencing this. I have contacted my university to check my sevis status n it says completed.To track the status I keep checking my email for the approval email and also the ceac.state.gov site to check the status but it still says” passport is with the embassy/ counsulate”. The case status was updated on 13 and then on 15 but it still says admin processing.Anyone with similar experiences? Would this be an issue caused due to delay in visa prinitings or any background verification. No one till now has been contacted yet neither my employer, client or my university.

Thanks