Minn. Stat. § 525.041: WRITTEN DECISION SHALL BE FILED WITHIN 90 DAYS; MANDATORY.

The decision of every issue of law or fact shall be in writing and shall be filed within 90 days after submission unless prevented by illness or casualty.

Upon the filing of any appealable order, judgment, or decree, except in uncontested matters or where the final decision was announced at the hearing, the court shall give notice by mail of such filing to each party, or the attorney, who appeared of record at the hearing.