Light years.
450 years.
On January 19, 2006 a space probe was launched and sent to Pluto. It was expected to reach Pluto in 2015. So it would take about 9 years to get to Pluto.
The closest Pluto gets to the Sun is 4.4 billion kilometers, which means that light from the Sun always takes longer than 4 hours to reach Pluto. For a rocket vehicle travelling at the speed that astronauts went to our Moon (less than 40,000 km/hr), it would take over 12 years to reach Pluto!
100 years
Sound waves can't travel through space.
The trip would only take 5.64 seconds to reach Pluto (about 4.7 billion miles) at that speed.
One year
That depends a lot on the speed. Use the formula: time = distance / speed.
At 13 km/s, it would take approximately 32 years to travel from Pluto to Earth. At 23 km/s, it would take approximately 18 years to make the same journey.
Pluto's orbit is highly eccentric. When Pluto is at its minimum distance form the Sun, sunlight takes about 14800 seconds to reach it (just over 4 hours). At its maximum, the light takes about 24600 seconds (nearly 7 hours).
Ask James Kirk - faster than light is science fantasy.
The average distance between Earth and Pluto is 38.5 AU, or 3,580,500,000,000 miles. So, if we hopped in some kind of interplanetary car and set out for Pluto at 100 MPH, we would reach the dwarf planet in approximately 4,084,531 years. Talk about your long car trips!