Hate to be that guy but contrary to popular belief light years are a measure of distance not time. But I get your point
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The thing is that traveling that distance depends on what your using, assuming its space then it depends on the fuel, what model of rocket. Mission(supply for other missions will be slower) or People carrying. There is just to many things to take into account to give one specific time, but a lightyear is 5.88 trillion miles roughly.