Except as provided in subsection (b) of this section, a court in which a motion for a new trial in a criminal case is pending shall hear the motion: within 10 days after the motion is filed; or if an agreed statement of the evidence or a statement of the evidence certified by the trial judge is filed, within 10 days after the statement is filed. The time for the hearing of a motion for a new trial may be extended by: a written agreement, signed by the State’s Attorney of the county in which the motion is pending and the defendant or the defendant’s counsel; or an order signed by the trial judge.