H1B visa approved in interview still 221(g) with DS 5535 form

[Sharma27]

Hello everyone,

I appeared in H1B visa interview on April 22, 2019.
VO asked basic question and said my visa is approved. She kept passports and said I will get it within 3 to 5 business days.
Once I reach home, I received email saying my application is refused under 221(g). Also, fill out attached DS 5535 form and send it back to us for further processing.
That form requires to provide past 15 years employer, address, phone, email, and social media history.
I replied to the their email with my details.
Does anyone of you know how long it will take to complete this processing?
Any timeframe or next steps?

Thanks.