The State Department is currently reviewing some 55,000 pages of emails which were turned over to it by personal staff of Clinton, the Washington Post reported.
Officials, however, have not said how long they would take in reviewing these emails.
"We are not going to prejudge the outcome of the review of Secretary Clinton's 55,000 pages of e-mails," a State Department official was quoted as saying.
A day earlier, State Department Deputy Spokesperson Marie Harf said that the agency would try to do it as soon as possible but this might take time.
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Kerry is the first Secretary of State, who is using official State Department email.
Clinton in a tweet late Wednesday night had said she has asked the State Department to make these emails public as soon as possible.
According to Buzzfeed, even as Clinton has handed over 55,000 pages of her emails to the State Department, an undisclosed number of pages from the email account that Clinton used exclusively during her four-year tenure as secretary will remain private.
Clinton's use of personal email while serving as secretary of state raises serious questions about transparency and accountability, said The Sunlight Foundation, a non-profit organisation.