This is from the September 14, 2003 program of
Meet The Press, hosted by Tim Russert.
(Link goes to a complete very incomplete transcript.)

Cheney On The Plan For Iraq (Or Lack Of One) (Small – 7 MB)
Tim Russert: “What is our plan for Iraq? How long with the 140,000 American Soldiers be there? How many international troops will join them? And how much is this gonna cost?”
Cheney: “Well, some of those questions are unknowable at present. They will depend on developments — depend on how fast it takes us to achieve our objectives.”