Second Visa interview after 221g

[prasad_2k2]

Hi,
I attended my first Visa interview along with my wife on 6-Sep-2018. We were handed over 221g white slips and our Visas were put in Administrative Processing. Today, I got an email from Hyderabad consulate asking me to appear for a second interview on 5-Oct-2018.

Did any one have similar experience? I wanted to know what I need to prepare. Do I need to carry any additional documents? How long does it take to get the Visa approved after the second interview?

Thanks