Because visible light is emitted at a known frequency (a time) and then it is as simple as Speed = Distance / Time therefore Distance = Speed x Time.
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That's a distance, and there's no direct conversion between distances and time. If you'd given a speed, then it'd be possible to calculate a travel time.
Speed (in the radial direction) = slope of the graph.
The speed of light is 1,079,252,848.8 kilometers per hour.
Speed of light * * * * * Nothing, since the speed of light in vacuum is around 1080 million km/h. In any case, the "speed of light" does not travel!
Distance divided by speed will give you the time it took to travel the distance.