We now have a better idea of how long Jimmy Fallon will be made to spin in an NBC.com hamster wheel before his big network debut: The Leno/O’Brien passing of the not-entirely-thought-out-torch will occur at the end of May 2009: “Jay Leno will sign off as host of The Tonight Show on May 29, 2009, with Conan O’Brien taking over the storied franchise on Monday, June 1, 2009.” Asked for comment on this Jeff Zucker-hunch gone awry (that comes with a reported $40 million penalty fee to O’Brien should they pull out), NBC co-chair Marc Graboff told the TCA, “We made our decision and I’m happy with it. NBC will continue to dominate late-night.” [TV Week]