Ganymede doesn't orbit the Sun directly. It orbits Jupiter, which in turn orbits the Sun.

Here's the breakdown:

* Ganymede's orbital period around Jupiter: About 7.15 Earth days

* Jupiter's orbital period around the Sun: About 11.86 Earth years

So, while Ganymede completes an orbit around Jupiter in a little over a week, it takes over 11 years to complete one orbit around the Sun along with Jupiter.