Longevity goes hand in hand with the actual scent for me. No, I won't buy Joop because it has longevity if I don't like the smell. Nor will I buy West Indian Limes by Geo Trumper, although I like it a great deal, because it lasts about 20 minutes. What is the point of a scent that you cannot smell? Especially when spending $40 and up on average for the typical fragrance these days. Sure, the scent is the deal maker but only if it is visible/discernible.
I have some scents that I enjoy that don't last very long (2 hours or less) that I rate lower for that reason. If I can get 6 hours, that is acceptable to me.