The time it takes for a satellite to reach Neptune depends on various factors, such as the speed and trajectory of the spacecraft, the distance between Earth and Neptune at the time of launch, and the alignment of the planets.
The Voyager 2 spacecraft, which is the only spacecraft to have visited Neptune, was launched on August 20, 1977, and reached Neptune on August 25, 1989. The total travel time for Voyager 2 to reach Neptune was approximately 12 years and 5 days.
During its journey, Voyager 2 used gravitational slingshot maneuvers around Jupiter, Saturn, and Uranus to increase its speed and adjust its trajectory, which allowed it to reach Neptune more quickly than it would have otherwise. However, the exact travel time for a satellite to reach Neptune would depend on the specific mission design and other factors mentioned above.
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