Rule 6. Computing and Extending Time; Time for Motion Papers
No such deadline currently appears in the Federal Rules of Civil Procedure. But some statutes contain deadlines stated in hours, as do some court orders issued
Regulatory Procedures Manual - Chapter 6: JUDICIAL ACTIONS
Once a complaint for injunction is filed by the United States, a hearing may be placed on the court calendar at any time with extremely short notice.
Case Distribution Schedule - Supreme Court of the United
The Case Distribution Schedule identifies the dates on which petitions for writs of certiorari, along with corresponding briefs in opposition and reply