I had to write him on this one.
From the new book "Star Trek: Iím Working on That"
"The swiftest object we humans have created is a spacecraft called Pioneer 10, launched from earth way back in 1972. About twelve years ago it departed the solar system, zipping along at twenty-five miles a second, a pretty stout speed. (Iím lucky if I can go twenty-five miles an hour on the freeways of Los Angeles). Having left our relatively crowded solar system behind, Pioneer 10 now finds itself sailing through a vast vacancy, as solitary as a clam. Even traveling at 90,000 miles an hour, it is moving 7,500 times slower than the speed of light."
Pioneer 10 is the third fastest man made extrasolar body. It's real speed is 27,380 mph. It is slower than Voyager 1 (39,000 mph) and Voyager 2 (35,000 mph).
"The nearest star to Earth, other than our own sun, is Proxima Centauri, combusting 4.3 light-years away. It will take Pioneer 10 32,000 years to get there. And this is the closest star! It will take 15 billion years for it to reach the next galaxy."
The math is right for 90,000 mph. But Pioneer is
1) not going that way
2) traveling at 27,380 mph
It would take 105,160 years to reach Proxima Centuri.
Link to book quotes