How long to stay in a job and when to move on?

That's something that most employees would ask and here's Mashable trying to answer that:

Six years (72 months) is the point at which it starts to hurt you if you're not getting promoted or receiving better projects. Four years with an on-boarding year and then a flat trend or lateral moves is fine; four years means you did your job, gave the company a thorough chance, didn't piss off too many people and moved on. Six or more years without an obvious record of promotion may suggest that you're unambitious and, while not necessarily expendable, thoroughly mediocre. If you keep getting promoted, however, there's no upper limit on how long you can stay at a job.

What do you think? Hmmm...