I get great longevity and great projection as well--my wife could smell it as soon as I stepped in the door after 8 hours or so. It could also be skin type.
I just came across a semi-vintage bottle of Fahrenheit (from 1998) and I put it on and poof, after 2-3 hours it's undetectable on my skin. Such a shame because I love it! But skin types do make a surprising amount of difference as well.