Only one. Because Light year is a messure of distance not of time. Light year is the distance travelled by light in one year.
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A light year is a measure of distance, not time, representing the distance that light travels in one year. Therefore, there is no concept of "normal years" within a light year.
0.0000158132211 light-year.
1 Parsec = 3.26163626 light years
587 light years is a unit of distance, not time. It represents the distance that light travels in 587 years.
1 light-year = 9.46*1012 kilometers 50,000 light-years = 4.73*1017 kilometers
1 trillion light years = 5.87849981 × 1024 miles.