Yes. Time limit to file appeal before Appellate Authority, for an assessee (person aggrieved) is 3 months from the date of communication of the order. Whereas in case of an appeal filed by the department on the basis of the directions by the Commissioner shall have to be filed within 6 months from date of communication of the decision or order.
(ICAI FAQ PUBLICATIONS 06-09-2017 APPEALS AND REVISIONS : FAQ NO. 5)