It would be easy to hand you a fixed number of hours here, but that wouldn't be honest. Longevity isn't a fixed property of any perfume, including every fragrance in the Cities Collection. It moves with your skin type, how much product you apply, and the climate you're wearing it in, and that's true whether you're wearing Valencia in July or Casablanca in December.

• Skin chemistry: Naturally oilier skin holds fragrance oils longer and carries a base note further into the day. Dry skin lets top and heart notes evaporate faster, so citrus and fruit notes in Valencia, Spirit of Valencia, or Soul of Bali fade sooner, and the same is true of the fruit notes in Casablanca.
• Heat and humidity: Warm skin diffuses fragrance molecules faster, which can make a scent feel louder and closer up front but also cause it to burn off sooner. This cuts both ways — it's part of why a citrus fragrance like Valencia can feel brighter in summer, and part of why a gourmand like Casablanca can feel heavier and more cloying in the same conditions.
• Application amount: More sprays extend wear time, but in heat this also means more projection than you may want in close quarters, such as an office or a crowded transit ride.

So rather than promising a set number of hours for any bottle in this collection, the honest answer is that Valencia, Spirit of Valencia, and Soul of Bali are built to perform well in summer conditions, while Casablanca, Opulence of Dubai, Passion of Venice, and Enigma of Taif are built to perform well in cool conditions — and where you land within either range comes down to your own skin and application, not the bottle alone.