Our products mainly designed for promotional use and they will last 1 week or more depending external factors and fragrance you choose. Some perfumes will perform weak, some strong, some will last longer than others. If you remove packaging gradually you could get up to 2 weeks life or more from 3ml perfume on each fresheners we will apply individually. These are promotional use products and this is longest life for promotional use fresheners. There is no guarantee on perfume life, however we expect you will get minimum 1 week from them even if you remove packaging all at once and more if you remove packing gradually. We could increase life of car air fresheners slightly at £50 extra per 1k if you wish.