The nearest star system to our solar system is the Alpha Centauri system, which is located about 4.37 light-years away.
If we could travel at the speed of light, it would take approximately 4.37 years to reach the Alpha Centauri system from Earth. However, according to our current understanding of physics, it is impossible for any object with mass to travel at the speed of light. As an object with mass approaches the speed of light, its relativistic mass increases, requiring an infinite amount of energy to reach or exceed the speed of light. Therefore, the speed of light is considered an absolute speed limit in the universe.
In reality, we haven't developed any technology that can approach the speed of light. The fastest spacecraft we have built so far, the Parker Solar Probe, travels at about 430,000 miles per hour (700,000 kilometers per hour), which is just a tiny fraction of the speed of light.