It has been 10 years since the New Horizons spacecraft captured the iconic heart-shaped image of Pluto. However, a return mission to further explore the dwarf planet and the rest of the Kuiper Belt is unlikely to occur soon. Given the long intervals between missions to Uranus and Neptune, a wait of 50 years or more for a follow-up mission to Pluto wouldn't be surprising, highlighting the challenges and time scales involved in deep-space exploration.