Zero. "Second" is a unit of time, whereas "light year" is a unit of distance.
The question is equivalent to asking: "How many days in a mile ?"
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Seconds is a measure of time. Light year is a measure of distance, There is no conversion between them.
1 lightyear is equal to approximately 16.098 billion miles when compared with the number of days.
a mega lightyear
It's calculated, not measured. It's the speed of light ... 299,792,458 meters per second ... multiplied by the number of seconds in a standard year.
one lightyear is equal to 5.87849981 × 1012 miles (thats 5 trillion, 878 billion, 499 million, 81 thousand miles).
over 26 billion miles 1 lightyear = 9.4605284 × 1015 meters