Rotation in the Milky Way: as I mentioned the rotation speed of the sun around the Milky Way center is approximately 200 km/s (actually to be precise, it's 220 km/s), and that it takes the sun around 200 million years to orbit once around center of the Galaxy.
Given that the rotation curve is relatively flat (ie the rotation speed stays the same as function of distance), how long does it take to make one full orbit for a star that is two times further from Milky Way center than the Sun?