Mo. R. Civ. P. 81.045
Time Shortened by Court or Motion. Any time after the notice of appeal is filed with the clerk of the trial court, the trial court, on its own motion, or on the motion of any party, for good cause shown, may shorten the 30-day period provided for in Rule 75.01. The motion shall be supported by an affidavit stating reasons why the party would be prejudiced by the 30-day period before the judgment would be final for purposes of appeal under Rule 75.01. If the trial court overrules the motion, the party seeking to shorten the 30-day period may file a similar motion in the appropriate appellate court, which shall decide the matter without deference to the trial court's denial. The provisions of this rule do not apply to judgments resolving fewer than all the remaining claims or parties as provided for in Rule 74.01(b).
Mo. R. Civ. P. 81.045