Fragrances are being produced in different strengths and have different longetivity. There can be different reasons for this.
Some fragrance supposed to refresh only, but not hanging on you all day. This way you can also change to a different scent later. While others meant to follow you all day long, cause you just want to smell like that particular scent and feel confident about being wrapped into it.
Not only the perfume oil concentration determines the strength and longetivity of a fragrance, but also the ingredients used in it.
Eau Fraiche or Eau de Splash - the lowest concentration of fragrance composition. Contain about 1-3% perfume oil, a hint of water and lots of alcohol. This type of scent usually last for less, then an hour. Body splash or aftershave are good example.
Eau de Cologne or Eau de Toilette - contains about 8-12 % perfume oil, will last about 2-4 hours.
Eau de Parfum - definitely the most popular type of fragrance. Contains about 20-30% perfume oil, and will be with you for 5-8 hours.
Extrait de Parfum - also called as extract, pure parfum or parfum. The highest quality in fragrance world. 40-50% perfume oil concentration, finely selected, long lasting ingredients. Will not leave you without confident!