This is the 13586th most frequent Polish word.
piętnastominutowej
"Fifteen-minute" (genitive or related to a fifteen-minute duration).
Here, 'piętnastominutowej' serves as an adjective describing the noun 'przerwie' (break), indicating its specific duration.
Mieliśmy interesującą rozmowę podczas piętnastominutowej przerwy.
We had an interesting talk during a fifteen-minute break.
In this context, 'piętnastominutowej' again functions as an adjective, qualifying 'odprawie' (briefing) by specifying its length of time.
Pracownik wziął udział w piętnastominutowej odprawie przed spotkaniem.
The employee participated in a fifteen-minute briefing before the meeting.
Similarly, 'piętnastominutowej' is used adjectivally to describe 'sesji' (session), denoting it lasted fifteen minutes.