A light year is a measurement of distance not time. A light year is the distance that a point of light will travel given 1 years time so in a round about way it has 365*24*60 minutes but it's still not a measurement of time

There are 31,557,600 seconds in a Julian year. This yields: 31,557,600/60 = 525,960 minutes So there are 525,960 light-minutes in a light year. 1) "A light-year or light year (symbol: ly) is a unit of length, equal to just under ten trillion kilometres. As defined by the International Astronomical Union (which is the body which has the jurisdictional authority to promulgate the definition), a light-year is the distance that light travels in a vacuum in one Julian year." "The figures above are based on a Julian year (not Gregorian year) of exactly 365.25 days (each of exactly 86,400 SI seconds, totalling 31,557,600 seconds)" Source and further information: http://en.wikipedia.org/wiki/Light_year 2) "A light-minute (also written light minute) is a unit of length. It is defined as the distance light travels in an absolute vacuum in one minute or 17,987,547,480 metres (~18 Gm), or 17,987,547.48 kilometers. (See 10 gigametres for similar lengths.) Note that this value is exact, since the metre is actually defined in terms of the light-second. To give an example, the average distance from the Earth to the Sun (or 1 astronomical unit) is about 8.317 light-minutes, or about 144 million kilometers." Source and further information: http://en.wikipedia.org/wiki/Light_minute