A shared work compensation plan shall be effective on the date agreed upon by the department and the employer but no later than the first day of the second calendar week after the date of the commissioner's approval, unless a later date is requested by the employer. The plan shall expire at the end of the twelfth full calendar month after its effective date, or on the date specified in the plan if that date is earlier, unless the plan is revoked before that date by the commissioner. If a plan is revoked by the commissioner, it shall terminate on the date specified in the commissioner's order of revocation.