They must ask for an extension within 30 days. They have 30 days to assess the request and the number of files. After that, they advise us if they cannot comply within the 30-day period and request an extension of 30 or 60 days. I recently received an application for a four-year extension for a request involving 75 million pages. It is up to us to determine whether these extensions are reasonable.
On March 11th, 2020. See this statement in context.