When restricting the duration of visits with detainees pursuant to the provisions of Article 55-58, paragraph (1) of the Act, the duration must not be less than 30 minutes; provided, however, that when it is found to be unavoidable in light of the status of requests for visits, the number of rooms designated as places for visits and other circumstances, the duration may be restricted to less than 30 minutes, to the extent that it is not less than five minutes.