There are approximately 7.61 x 10^20 inches in one light-year, a colossal number highlighting the difference in scale.

This is because a light-year represents an astronomically vast distance, while a billion inches is relatively tiny on a cosmic scale.

Direct conversion is not typically used in practical astronomy as measurements are usually made in light-years, parsecs, or astronomical units (AU) for cosmic distances.

It's primarily for educational purposes to help visualize and understand the extreme difference in scale between everyday measurements and the vastness of space.