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.
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48 what, meters? inches? furlongs? light-years? 48 what, meters? inches? furlongs? light-years?
7.5 light years = 7.0955478544356E+16 meters.
one billion light years = 5.87849981 × 1021 miles
1.44
Wherever "mega" is use in physics, it always means "million".