How long does it take light from the Sun to reach Earth?
Earth's distance from the Sun varies between about 147 and 152 million kilometers. Given the speed of light as 299,792,458 m/sec and the Sun's radius of 696,000 km, this makes the time taken for the journey (from the Sun's surface to the Earth's) between 8.14 and 8.42 minutes. On an average, it is about 8.28 minutes or 8 minutes and 17 seconds.
If you mean "How long does it take for light from Schedar to reach Earth?", then just use the formula: Distance equals speed times time, or more easily look up the distance in terms of lightyears. Wikipedia gives Schedar as being 228 LY's away...or it will take 228 years for the light to reach Earth.