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Way back in 2003 there was a plan for a Pluto orbiter and "hopper" lander. The trip out to Pluto was going to be 14-16 years depending on the launch window. So, 2-3 years to build the thing, then launch, then get there, then deal with the data transfer back home assuming all goes well. This is where I got the 20 years from. And if we are going to go back to Pluto, IMO, we should go to orbit and land, stay a while, and push our abilities to the limit. Link to the idea for the mission is here but they could not get the funding, and got New Horizons pushed through instead.why 20 years?