The district court shall always be in session. At least two regular terms for each county within a judicial district shall be established by court rule. When for any reason a district judge is prevented from attending a regular term of the district court on the first day, he may, at any time during that term, enter an order fixing another return day for all process, bonds and recognizances returnable at that term. The order fixing the return day shall be filed with the district court clerk, who shall post a copy at the courthouse for at least ten days before the return day. Juries shall be empanelled [empaneled], cases shall be set and tried and all other business of the district court shall be conducted in any county at any time as directed by the district judge.