The 1963 March on Washington for Jobs and Freedom was one of the largest civil-rights demonstrations ever conducted in the US. More than 200,000 people heard civil-rights leader Martin Luther King, Jr., deliver his "I Have a Dream" speech, which is considered one of the finest speeches in the history of American oratory. However, his prepared text did not mention a dream—King composed that section on the spot, likely at the urging of gospel singer Mahalia Jackson. For how long did King speak?