The term lightyear(s) has nothing to do with time. It is used as an unit to express astronomical distances, hence is more related to distances. 1 light year is the equivalent in distance to what light would travel in a year at the rate of approximately 186000 miles per second.
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1,000,000,000 light-years (one billion light-years) are in one Gly
3.26 light years equals 3.08413226 × 10^13 kilometers.
440 light years = 2.58653992 × 1015 miles
10 10ths is 1 - whether it is miles, milometres, micrometres or lightyears, or pounds, or people or anything.
1 decade = 10 years