Actually I could never understand why it is considered such a big accomplishment to spend many years at one job. Usually if you are not changing employers it means you are not advancing your career as fast as you could. Forbes article I once read advised to change jobs every 2.5 years. It is considered the optimal time to gain experience and move on to the higher position in another company.

Everyone I personally know who are successful professionals don't stay at one place much longer than 3 years. Most of them are very young people still, so that might be partially generational shift. I know it was a norm to stay at one company for many years for baby boomers.

But times have changed. No one is going to look at your weird if you have a position you staid at for 3 years on your resume. Actually, I think most employers would like that very much.

Personally, I've changed jobs every 2 years in the last 5 years. I was always able to get a better one next time.

The only people I know who are stuck at the same company at the same position for many years are people who have something seriously wrong with them and know that finding next employment opportunity will be very had for them, so they just lay low.