In Hartsfield v. Fantini, 149 N.J. 611, 616-17, 695 A.2d 259 (1997) the Court held that the thirty-day period to file a notice of rejection of an arbitrators' award and demand for a trial de novo may be extended upon a showing of extraordinary circumstances. To relax the thirty-day rule, a court must determine that "extraordinary circumstances" exist and that those circumstances did not arise from an attorney's "mere carelessness" and "lack of proper diligence." Hartsfield, 149 N.J. at 618, 695 A.2d 259.