Licensees shall not be required to notify the Commissioner in order to close their establishments for a cumulative period of fourteen days or less in any calendar year or in order to change their hours of operation during such a limited period of time; provided, however, that any licensee which closes for fourteen days or less or temporarily changes its hours of operation shall conspicuously post notice of that fact at all public entrances to the licensed premises.
4 Del. Admin. Code § 1003-3.0