The answers above give the time taken for heat (and light) to reach the Earth from the Sun's surface. This energy is created from nuclear reactions deep in the Sun and it takes an amazingly long time to reach the Sun's surface - according to Wiki "(estimated) between 10,000 and 170,000 years."
http://en.wikipedia.org/wiki/Sun
So if you are asking how long after generation the Sun's heat reaches the Earth, we could say 170,00 years and eight minutes!
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