mroxs4444
How many years in 1 light year?

One.

A light year is measure of distance. Not time.

It is the distance that light travels in a vacuum in one Julian year (Western calendar).

It is much easier to deal in light years than it is to calculate multiples of five trillion, eight hundred seventy-eight billion, six hundred thirty million (5,878,630,000,000) miles.

Light year is not a unit of time. It is a unit of distance and could be expressed in kilometers or miles or something like that. One light year is the distance travelled by light in one year at the speed of 300 000 km/second.