Simon Cowell says he will quit as judge of American Idol and the similar British show The X Factor in three years time, when his contract runs out. He told the Daily Mirror: “There has to come a point when I will step down from being on camera and remain behind the scenes because you can’t keep doing this forever. I have three more seasons under contract with American Idol and that will be it. And it will probably come at the same time as the UK. I am contracted for another two or three seasons in Britain and I think by that point the public will be sick to death of me anyway so it will be time to go. I’ve been lucky, but I also know when not to outstay my welcome.