Sunlight takes about 8 minutes to reach Earth.
Why it is true
Sunlight travels at 300,000 kilometres per second and covers the average distance of 150 million kilometres between the Sun and Earth in about 8 minutes and 20 seconds. This means we see the Sun as it was 8 minutes ago.
Source: NASA
Would you rather be asked first?
This is the reading side of the site, so the answer is in the sentence above — that is the whole point of it. Test yourself works the other way round: the question comes on its own, and the fact and the explanation only appear once you have answered.