The Time it Takes for Spacecraft to Reach Jupiter.

Spacecraft take longer to reach Jupiter if they need to enter into orbit around the planet, as they require a certain change in velocity (∆v) that cannot be provided by a rocket at launch. To steal this extra velocity, spacecraft use gravity assist maneuvers by flying past planets and stealing their orbital velocity. The European Space Agency's JUICE mission will reach Jupiter in 2031 after an 8-year journey, during which it will fly past Venus once and Earth three times to steal velocity. JUICE will become the first spacecraft to orbit a moon other than our own when it goes around Ganymede.