I love L'eau Par Kenzo, but I've gotten between 5-9 hours out of it. It really depends. Sometimes, it just lasts for about 4 hours and I can't smell it anymore. THEN, sometimes it's still on my skin and a bit on my clothes, so it sticks around for quite a while even utnil the next morning (just a really light whiff). Not crazy sillage after 3-4 hours, but I can still get a whiff of it here and there. Kenzo fragrances aren't exactly tops with longevity, however, so your results may vary. I heard Azzaro Chrome lasts for a pretty long time and it fits what you're looking for. The ones that seem to last for the vast majority of the day are the vetiver soapy citrus scents like Creed Original Vetiver, Thierry Mugler Cologne, Paul Smith Story, etc.