The record for the longest filibuster goes to U.S. Senator Strom Thurmond of South Carolina who, according to U.S. Senate records, spoke for 24 hours and 18 minutes against the Civil Rights Act of 1957.

Thurmond concluded his filibuster after 24 hours and 18 minutes at 9:12 p.m. on August 29, making it the longest filibuster ever conducted in the Senate as of 2024. This surpassed the previous record set by Wayne Morse, who spoke against the Submerged Lands Act for 22 hours and 26 minutes in 1953. Teams of Congressional stenographers worked together to record the speech for the Congressional Record, which ultimately consumed 96 pages in the Record and cost over $7,000 in printing costs ($76,000 in 2023 dollars).