Within sixty days after the conclusion of the public hearing, or within the sixty days after filing the plan of reorganization if by mutual agreement the hearing is waived, unless there is a mutual agreement by the commissioner and the reorganizing insurer to extend such time, the commissioner shall enter findings of fact, conclusions of law, and an order either approving, conditionally approving, or disapproving the plan. An approval or conditional approval of a plan of reorganization expires if the reorganization is not completed within one hundred eighty days after the approval or conditional approval, unless the time period is extended by the commissioner upon a showing of good cause.