- continuous service
勤続する serve for long years; be in continuous service
- 父は永年の勤続により表彰された
- My father was honored in recognition of his long service.
- 彼はその会社に30年勤続した
- He served [worked] in the firm for thirty years.
- 勤続手当a long-service allowance
- 勤続年限に応じて
- in proportion to the length of one's service