What is the ordinary time limit to appeal an NCLAT competition decision to the Supreme Court under section 53T, counted from communication of the decision?

Section 53T of the Competition Act, 2002 allows an appeal to the Supreme Court within sixty days from the date of communication of the decision or order of the Appellate Tribunal, now the National Company Law Appellate Tribunal. The Supreme Court may allow a later appeal if sufficient cause is shown.