I have the Jet Boil SOL TI stove...an awesome stove and I consider it to be my best piece of hiking gear. Having been stuck in the cold with a stove that couldn't boil water at cold ambient temps, it's a joy to use.
But realistically, what can someone expect from the standard size fuel canister? I'm guessing about about a week with normal use (boiling water 3 to 4 times/day, etc). Is that realistic? I'm sure eveyone's "milage" will vary, but what have you found in your experience?