Traveling a distance of 4 light years would require an amount of time equal to or greater than 4 years. This is because the term "light year" is a unit of distance, specifically the distance that light travels in one year in the vacuum of space, which is approximately 9.461 trillion kilometers (5.879 trillion miles).
Since nothing can travel faster than the speed of light according to our current understanding of physics, it would take at least 4 years to cover a distance of 4 light years, assuming constant velocity and a straight-line path. However, it's important to note that traveling such vast distances is currently beyond our technological capabilities.