kestoaikailla

Kestoaikailla is a Finnish word that functions as the adessive plural form of the noun kestoaika. The base word kestoaika refers to a period of time during which something remains valid, usable, or applicable—often translated as shelf life or duration. The form kestoaikailla appears in grammatically specific contexts where multiple such time periods are being discussed and a location or context is being indicated.

In Finnish, the adessive case conveys meanings related to location, occurrence, or context, and plural adessive forms express these ideas for multiple items or instances. Therefore, kestoaikailla can be understood as “on/at the durations” or “for the durations” in a sentence that mentions several time periods. Because Finnish has a highly productive system of case endings and compounding, kestoaikailla exemplifies how a compound noun can inflect to indicate number and case.

Usage and notes can be more common in technical, regulatory, or linguistic texts than in everyday speech. In ordinary language, speakers may prefer other forms (such as different cases or plural forms) depending on the intended meaning and syntactic structure. The word both reflects standard Finn­ish morphology and illustrates how compound nouns behave within the case system.

Related terms include kestoaika (singular), kestoajat or kestoaikojen (plural nominative/genitive forms depending on the context), and other phrases describing time-related validity or duration. As with many inflected forms, the exact choice of form depends on the grammatical role in the sentence.