I don't think a new one would take 30 years.

http://www.grc.nasa.gov/WWW/ion/overview/overview.htm

It tops out at 90,000 meters per second.

http://voyager.jpl.nasa.gov/mission/interstellar.html

The furthest one out is 17 billion kilometers.

http://www.google.com/search?sourceid=chrome&ie=UTF-8...

http://www.google.com/search?sourceid=chrome&ie=UTF-8...

That's about six years, though I don't know how long it would take to reach the top speed.