How long would it take to get to mars from earth at the speed of light?

When Earth and Mars are lined up, on the same side of the sun, as close together as they can get, light or radio take about 4.4 minutes to make the trip When earth and Mars are lined up on opposite sides of the sun, as far apart as they can get, the trip is about 21 minutes.

About an hour but if it was not in speed of light it would take about 7 Earth years and 16 days.

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