A month is what the House thinks is appropriate:
The House of Representatives agreed to extend a controversial domestic surveillance law this afternoon, but it limited the extension to one month and rejected a carefully brokered compromise from the Senate that had given the law a six-month reprieve.
Prediction I: Post-holiday showdown takes place on another multi-year version (3 years sounds about right), much flailing about over mostly-percieved loss of liberties, ultimately passage. (.8).
Prediction II: Bush threatens veto over House/Senate one-month extension (.6).