Does anyone know if the FDA response time of 30 da

Does anyone know if the FDA response time of 30 days is in calendar days or business days? The FAQ posted on Nov. 3rd said they had submitted responses already so being as conservative as possible and assuming they submitted them earlier in the day prior to the FAQ release, the 30 day window would be up on Sunday December 3rd if it's calendar days but it could be as late as December 19 if it's business days. Obviously hoping they submitted a week or two before so that we can expect a response by the end of the month but I won't hold my breath on that.