Officer took passport and given back yellow slip 221g

HI,

I interviewed on 28 Jan 2021 in New Delhi for Fresh H1B Visa. Visa officer took my passport and also taken document which tell about my employer is exempt from Trump Proclamation (Ban).

Visa officer told that they will verify document and update your status.

Its been 8 days now, my case status on “https://ceac.state.gov/CEACStatTracker/Status.aspx” appears to be refused and case last updated date is 28 Jan 2021.

How long they can keep passport for verification of documents

Any leads and info is appreciated. Thanks in advance