O.C.G.A. § 9-10-181

If counsel on either side, before argument begins, applies to the court for extension of the time prescribed for argument and states in his place or on oath, in the discretion of the court, that he or they cannot do the case justice within the time prescribed and that it will require for that purpose additional time, stating how much additional time will be necessary, the court shall grant such extension of time as may seem reasonable and proper.