two different units of measure. It's like asking how many seconds in a mile.
But there are 365.25 light days in a light year if you assume a day = 86,400 seconds and you use the Julian definition of a year.
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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.
One quarter
36,500 days. 365x100=36,500 DAYS IN ONE YEAR.
11,574 days