Dior Homme Intense
Showed it to a colleague of mine. He sprayed his wrist and rubbed it on his other wrist and neck.
I could still smell it everywhere in his office which is quite big at the end of the working day.
Sooo...
Dior Homme intense, 1 spray, 10 meters, 8+ hours!

He later told me his wife could smell it on him in the evening so its 12+ hours!
