Traveling 4 light years, assuming you are referring to the distance light travels in a year, would take 4 years. This is because light travels at a speed of approximately 299,792 kilometers per second (or about 186,282 miles per second) in a vacuum, which is equivalent to about 9.46 trillion kilometers (or about 5.88 trillion miles) per year. Therefore, to cover a distance of 4 light years, it would take approximately 4 years of travel time.