Stay period for proceedings precisely defined, beginning with grant of stay and ending on certified receipt of vacating order. The Explanation to section 264(6) is amended by substituting the prior phrase describing a stayed period with wording that defines the stay period as commencing on the date the stay was granted by an order or injunction of any court and ending on the date on which a certified copy of the order vacating the stay is received by the jurisdictional Principal Commissioner or Commissioner.