Administrative Process Duration. US Tourist Visa

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Hello, my B1/2 US Tourist Visa interview ended up on Administrative Processing for additional documents needed, I sent everything they asked, with the status still being rejected. After two mails, one after 60 days and other after 90 days, all answers I get from the embassy is that it is still in process and they will let me know of the decision.

Will I get an email if the decision remains rejected? What is the maximum duration of the Administrative Processing? It's been already 3 months. Thank you for the help