...Mostly it doesn't depend on the price, but it depends on the fragrance. Citrus lasts only a little while. Spices last medium long. Vetiver (Cerruti 1881) can last a long time, that too depends on which fragrance. So it also depends on the fragrace 'note' (the kind of scent)In my opinion, 15-20 sprays is too much. In your case I would buy a travel sprayer to take fragrance with me, that way you don't have to apply 15-20 sprays in the beginning. Or just use a (scented) deodorant for the 2nd part of the day.Yes, it really depends a lot on the fragrance itself and on the notes. Online there are lists with fragrances that last a long time. Some of my favorites are:- Versace Dreamer (vanilla/tonka, affordable)- l'Eau d'Issey by Issey Miyake (clean, lasts more than 8 hours)- Le Male by Jean Paul Gaultier (pleasant vanilla + lavender)- Also 'Old fashioned' scents can last a decent while, try Davidoff Zino (rosewood + patchouli), look for a bargain.- If it fits your character, the super spicy Opium pour Homme by Yves Saint Laurent also lasts longer than 8 hours.