Traveling at the speed of light is not currently possible according to our current understanding of physics. However, let's assume for the sake of this hypothetical scenario that it is achievable. Here are the approximate travel times to each planet in our solar system from the Sun, assuming a constant speed of light:
Mercury: It takes light approximately 3.2 minutes to travel from the Sun to Mercury.
Venus: Light takes about 6 minutes to travel from the Sun to Venus.
Earth: Light takes approximately 8.3 minutes to travel from the Sun to Earth.
Mars: It takes light about 12.5 minutes to travel from the Sun to Mars.
Jupiter: Light takes approximately 43 minutes to travel from the Sun to Jupiter.
Saturn: It takes light about 1 hour and 18 minutes to travel from the Sun to Saturn.
Uranus: Light takes approximately 2 hours and 40 minutes to travel from the Sun to Uranus.
Neptune: It takes light about 4 hours and 8 minutes to travel from the Sun to Neptune.
Please note that these times are approximate and based on the average distance between the Sun and each planet. The distances between the planets are not constant due to their elliptical orbits, so the travel times would vary depending on the positions of the planets at the time of travel.
Again, it's important to emphasize that traveling at the speed of light is currently beyond our technological capabilities, and the times provided above are purely hypothetical.