The expiration date of your visa is the last day you may use the visa to enter the United States. It does not indicate how long you may stay in the United States. Your stay is determined by the Department of Homeland Security at your port of entry.
In some circumstances, a person may be released from custody without bail and be given an order to appear, with certain conditions as governed and directed by a court-affiliated agency. Project Remand ('PR'), a Ramsey County pre-trial court service program, is one example of such an agency.
Upon arrest bail will be set by a magistrate or judge in most cases. Bond and bail guidelines are governed by Article 26 of Chapter 15A of the North Carolina General Statutes, and by local rules as established by the Chief Resident Superior Court Judge and Chief District Court Judge of each judicial district.