This is the 4343rd most frequent Japanese word.
勤続
Continuous service or long-term employment.
Here, '勤続' refers to the duration of uninterrupted service at a workplace.
彼は勤続20年のベテラン社員です。
He is a veteran employee with 20 years of continuous service.
In this sentence, '勤続' is used to describe the length of service affecting benefits.
勤続年数が長いほど退職金が多くなる。
The longer the years of continuous service, the higher the retirement allowance.
Here, '勤続' denotes the ongoing period of employment at the company.