1 light year is how many times 60 battery operated monkeys can go round the earth's circumference in 1 year; from this distance is calculated as a relative parameter. An earth year is a totally different unit of measurement, as correctly pointed out previously.

A light year is a unit of measurement, not time.

Earth Years measure time. Light years measure distance. They cannot be compared like that since they measure two completely different things.

A light year is a unit of DISTANCE, not a unit of time. 1 light year = the distance light travels in one year is close to 6 trillion MILES (not 6 trillion years).