Most people apply perfume as if it were a finishing touch, a last thing sprayed on the way out the door. This is backwards. Where and how a fragrance is applied decides almost everything about how it behaves for the next eight hours, and most of what is taught about application in fragrance counters and blogs has little to do with how scent actually moves on a body.
Start with heat. Perfume is not worn on skin so much as it is worn on warmth. The wrists, the inner elbow, the base of the throat, behind the ear — these points are chosen not because tradition says so but because they run warmer than the rest of the body, and warmth is what releases a composition's oils into the air around you. A fragrance sprayed onto cold skin in an air conditioned room will sit flat. The same fragrance on a warm neck in the evening will unfold in stages, exactly as the perfumer intended.
Resist the instinct to rub the wrists together after applying. This is the most common mistake, and it comes from a misunderstanding of what perfume actually is. Rubbing generates friction heat that burns off the top notes, the ones meant to introduce the fragrance slowly over the first fifteen minutes. Rubbing does not help a fragrance last longer. It shortens its opening chapter.
Apply before you dress, not after. A fragrance settles into hair and fabric as readily as it does into skin, and both hold scent longer than skin does on its own. This is closer to how attars were historically worn in Lucknow and Kannauj — not sprayed on as an afterthought but allowed to settle into cloth, into the folds of a dupatta, into the space a person moves through rather than only the point where it was applied.
Longevity is less about how much you apply and more about where. Two sprays at the base of the throat and one at the inner elbow will outlast six sprays across the wrists, because the throat and chest hold heat for longer through the day. If a fragrance is fading by afternoon, the answer is rarely more product. It is usually the wrong location entirely.
Let a fragrance finish its opening before deciding on it. What you smell in the first ten minutes is designed to fade. What remains after an hour — the fragrance's actual character — is the only part worth judging.