Speed of light is 3 million km/second. 
The distance between the earth and the sun is 149.6 million kilometres (that’s 92.95 million miles). Scientists calculate that the average time it takes for light to reach the earth from the sun is 8 minutes and 20 seconds.

At this speed, it takes the sun light about 8 minutes & 20 seconds to reach the Earth after it has been emitted from the sun’s surface.