That's kind of short. In the three kingdom period of the ancient Korea, the kingdom of Shinra lasted over 900 years, and other two kingdoms about 600 years each. The successive kingdoms after them lasted about 500 years each.

I know that in Japan, the emperor dynasty have been in position for about two millennia, but I am not sure if that can be actually called a 2000-year empire, because I heard that that there were periods when the emperors were just in-name only.