<Ol> <Li> ^ A fourth judge was added in season eight . </Li> <Li> ^ Beginning with season three, the prize includes the one million dollars, payable in a financial annuity over 40 years, and a chance to headline a show on the Las Vegas Strip . The length of the headlining stint has varied, with season four's prize including a 10 - week schedule and season eleven's lasting three days . </Li> <Li> A book was released in 2013 titled, Inside AGT: The Untold Stories of America's Got Talent . It describes the seasons, contestants, judges, and production techniques of the show and contains detailed interviews with contestants from all seasons . </Li> </Ol> <Li> ^ A fourth judge was added in season eight . </Li> <Li> ^ Beginning with season three, the prize includes the one million dollars, payable in a financial annuity over 40 years, and a chance to headline a show on the Las Vegas Strip . The length of the headlining stint has varied, with season four's prize including a 10 - week schedule and season eleven's lasting three days . </Li> <Li> A book was released in 2013 titled, Inside AGT: The Untold Stories of America's Got Talent . It describes the seasons, contestants, judges, and production techniques of the show and contains detailed interviews with contestants from all seasons . </Li>

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