term of service; years of service
Refers to the length of time one has served in a position or organization, often used in employment, military, or official contexts.
His term of service exceeds thirty years.
Retirement benefits are determined according to years of service.
勤続年数 is more commonly used for continuous years of service at a single company, while 勤務年限 can refer to a fixed term or total service period.
Compound of 勤務 (service, duty) and 年限 (term of years).