39 CFR §3022.12

1. (a)Unless otherwise ordered by the Commission, the Postal Service shall file its answer to a complaint within 20 days after the complaint is filed.
2. (b)If appropriate, the Postal Service may file a dispositive motion or otherwise move to delay disposition of the complaint. If the Postal Service files such a motion, unless otherwise ordered by the Commission, the period of time for filing its answer is altered as follows:
   1. (1)If the Commission denies the motion or postpones disposition, the answer is due within 10 days of the Commission's action; or
   2. (2)If the Commission invokes the rate or service inquiry special procedures under § 3022.13 to the complaint, the answer is due contemporaneously with the Postal Service's report under § 3023.11 of this chapter if the complaint has not been resolved by that date.
3. (c)If the Postal Service answer is delayed by the filing of a motion under paragraph (b) of this section, it may not obtain a further delay by filing another motion under paragraph (b) of this section raising an issue or objection that was available to the Postal Service but omitted from its earlier motion.