Live8 organisers have threatened to "revolve" stars like Madonna and Elton John off stage if they overrun on July 2, 2005 - the Mirror reports.
All the singers will perform on a 280ft-wide by 60ft-deep revolving stage. But they have been told to keep to a strict time-limit of 15 minutes.
An insider revealed: "To avoid wasting time, some of the acts will be setting up and dismantling while others are on stage - and if people do outstay their welcome they will be revolved out of sight."
Sir Paul McCartney will close Live8 with a moving rendition of The Beatles' classic The Long and Winding Road. A host of stars is expected to join him for a finale.
Bob Geldof reportedly revealed running order details in Rome last week. He said: "It will be a surprise for everyone. Paul McCartney will end it." Macca will also open the concert - with help from Irish rockers U2.
But a planned duet between Madonna and Sting has been dropped. Instead, Sting is understood to be using Spitting Image-style puppets of Tony Blair and George Bush. He is expected to change the lyrics of The Police song Every Breath You Take to "We'll be watching you".
