Under 17 U.S.C. 512(g), a site that took content down on a DMCA notice keeps its safe harbour by telling the creator, and - when a valid counter-notice comes - promptly sending the claimant a copy and saying the content will be back in 10 business days, then restoring it no sooner than 10 and no later than 14 business days after the counter-notice, unless the claimant first reports filing suit. A counter-notice is valid only with all six parts. Business days here skip weekends and federal holidays.