1. The Speed of Sound:

* The speed of sound in air is approximately 343 meters per second.

2. The Speed of Light:

* The speed of light is approximately 299,792,458 meters per second.

3. Calculating the Time:

* Divide the speed of light by the speed of sound: 299,792,458 m/s / 343 m/s ≈ 873,594.3

* This means light travels about 873,594.3 times faster than sound.

* A light-year is the distance light travels in one year.

* Therefore, it would take approximately 873,594.3 years to travel one light-year at the speed of sound.

In short: It would take an incredibly long time – almost 874,000 years – to travel one light-year at the speed of sound.