An initial order for a guardian to consent to involuntary treatment with prescribed mood stabilizer or antipsychotic medication may not exceed ninety days, unless the court is presented with evidence that the ward will continue to require treatment beyond the ninety-day period with the prescribed medication and the ward has historically declined treatment with subsequent harm to self or others. If the court determines the ward will continue to require treatment beyond the ninety-day period and orders continuing treatment, the order for a guardian to consent to continuing treatment may not exceed the term of the appointment of the guardian.