(1) When an investigative public official conducts an investigation under Article 80 and 81, he or she shall conduct the investigation within regular office hours of a business entity or trade association subject to the investigation; provided,, where it is impossible to achieve the purpose of an investigation through an investigation within regular working hours due to concerns over destruction of evidence, etc., the investigation may be conducted even during off-duty hours in consultation with the investigated company.
(2) An investigative official shall terminate investigations within the investigation period entered in a document referred to in Article 81(9); provided, if a sufficient investigation to achieve the purpose of the investigation has not been conducted within the investigation period, such period may be extended to the extent of minimizing the burden on the business of the business entity or trade association subject to the investigation.
(3) Where the investigation period is extended pursuant to the proviso of paragraph (2), a document specifying the extended investigation period shall be issued to the relevant business entity or trade association.