A light year is by definition a measurement of distance. I don’t think you could find a single physicist who would not agree indisputably with this statement (maybe a few high school science teachers).
Since the distance measurement is based on the speed of light you can easily infer a time measurement from it as regards light, but it is a distance unit. It is not a unit of volume, weight, mass or time.
This is confusing for many people so I wanted to clear it up.
from Wikipedia: “A light-year, also light year or lightyear, (symbol: ly) is a unit of length” It does not mention that it is also a unit of time.