http://www.planetary.org/...ing-to-pluto-is-hard.html 16 months http://www.planetary.org/(...)o-pluto-is-hard.html The Planetary Society website New Horizons' radio signal is about 1 kilobit per second it actually makes a dial-up modem look positively speedy Emily Lakdawalla at the Planetary Society two transmitters Talking to Pluto the maximum data planetary dot org Talking to Pluto is hard! http://www.planetary.org/...ing-to-pluto-is-hard.html