The difference between
Eau de toilette & Eau de parfum:
Eau de toilettes have a relatively light spray composition—5% to 15%—of pure
perfume essence dissolved in alcohol. Expect these to last for about 3 hours.
Eau de parfum are second only to their cousin perfume in strength. These contain
between 15% and 20% pure perfume essence and can last up to 8 hours.