This is the 1107th most frequent Russian word.
срока
"Срока" is a form of "срок," meaning "term" or "deadline" in English.
'Срока' refers here to the shelf life or duration period.
Прошлогодняя работа ещё не вышла срока хранения.
Last year's work has not yet expired its shelf life.
'Срока' refers here to the deadline or due date for a payment.
Срока оплаты по этому счёту ещё нет.
The payment deadline for this invoice has not yet come.
'Срока' refers to the time validity or expiration.