Kestustele
Kestustele is the allative plural form of the Estonian noun kestus, meaning duration or length of time. In Estonian, kestus refers to how long something lasts, and kestustele marks the direction or reference toward multiple durations in a sentence.
Grammatical note: Estonian uses cases to indicate the role of a noun in the clause. The allative
Usage: Kestustele occurs in formal or technical texts where multiple timeframes are being discussed or compared,