Wherever "mega" is use in physics, it always means "million".
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A light year is a measure of distance, not time. A light year is the distance light travels in one year. In one day light travels 16,081,407,123 miles.
7.5 light years = 7.0955478544356E+16 meters.
A light-year is a measure of distance, not time as many people mistakenly believe. One light-year is the distance light can travel in one year in the vacuum of space. One light-year equates to 5.8785 trillion miles.
one billion light years = 5.87849981 × 1021 miles
One Light Year is equal to 9454254955488 Kms