A light-year is the distance that light travels in a vacuum in one Julian year (365.25 days). It's a unit of astronomical distance, not time.

1 million miles is equal to approximately 0.00000000017 light-years. For simplicity, it's often rounded down to 0.0000 light-years when discussing vast cosmic distances.

Light-years measure incredibly large distances in space. 1 million miles is a very small distance compared to the scale of even the closest stars.

The Andromeda Galaxy, our nearest major galactic neighbor, is about 2.5 million light-years away.