The time it would take to travel 120 trillion miles depends on the speed of travel. For example, if you were traveling at the speed of light (186,282 miles per second), it would take approximately 214,748 years to cover that distance. However, with current technology, spacecraft travel at much slower speeds, so it would take significantly longer. In reality, the distance of 120 trillion miles is so vast that it is currently beyond our technological capabilities to travel such a distance within a reasonable timeframe.
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It all depends on your rate of speed.
Say you were traveling at a speed of OVER 9000 MPH, it would take you less time to travel 120 trillion miles than 1337 MPH.
120 trillion miles is roughly 20 light years, ie it takes 20 years for light to travel that far. Voyager 1, now leaving the solar system at a speed of about 39,000 miles per hour, would need more than 300,000 years to travel that far.