I have a feeling your question got cut off since you've got the phrase "years in" and are asking about retirement. You may be asking about when you'll be fully vested in your pension plan. That's a question either for your union rep if you have one, or for your employer's benefits department.
Reminder to fellow tutors: snarky answers don't help. You guys are among the best we have on these boards. Remember why you're here. Thanks.