H1B extension is stuck security check without RFE

Hi Anil
H1b file extension in regular processing March 2019 at Vermont location
Upgraded in premium May 2019
Attached asked to USCIS & they told your case went to security check. 240 day is approaching Dec 2019.
I have few questions.
How long does security check to take to complete.
What activity are involved in security check.
Do I need to take any action ?
Thanks in advance.

Hi @kishor222

There is nothing that you can do to expedite the security check. The premium processing also does not work with ‘security clearance’ process.

There is no fixed time frame for completion of security checks either. You can stay in US but cannot work after 240 days.