Most people generally rotate between three and five scents for the year or part of it, says Harris. That said, there is no strict rule about such things; the point is not to accumulate a trunk-load of bottles that will expire before you have used them all up (the shelf life for most fragrances is three to six months).
— British perfumer Lyn Harris, in A Perfumer’s Guide to Building the Perfect Fragrance Wardrobe in 2018 at Vogue.

