Alec Baldwin to stay on '30 Rock' two more years, if it stays too Alec Baldwin has committed to another two years for his role as Jack Donaghy on NBC's "30 Rock," NBC Entertainment Chairman Bob Greenblatt confirmed Friday. The news comes after Tina Fey said as much during her appearance Thursday on "Late Show With David Letterman." Still uncertain, though, is whether "30 Rock" will be around for two more seasons. No word on a seventh season - let alone eighth - renewal has been announced. In the past, Baldwin has been vague about his future on the show once his contract is up - which would have happened at the end of the sixth season - often suggesting that if he should return, it would be in a smaller capacity. The sixth season of the show premieres Jan. 12. Photo: Alec Baldwin. Credit: Getty Images.