how many years does it take for heat generated from core of sun to reach its outer layer?

Answer 1

"the typical time taken for radiation to diffuse from the centre and escape from the sun is about 50,000 years."

It's a random-walk problem. Photons are continually scattered, absorbed and emitted by particles in the sun.

Answer 2

Heat generated by the nuclear reactions in the core of the Sun actually take over 200,000 years to reach the outer layer. From there it's only a few minutes to Earth.

Answer 3

The truth is that it never reaches it.
The sun exists in a state of hydrostatic balance with each subsequent transition in the process of fussion changing the actual composition or atomic structure of the material at hand .
So just as nuclear fusion at the core cannot end up on the surface, heat at the core cannot end up as the same heat on the surface.
There is no stepwise movement of a layer of heat. It's a transition of matter from one state to another, not a transit of heat
I know it sounds ridiculous and without being able to do the math to describe it, it is ridiculous however, I think the best way I can explain the process is by using a biological phenomena which is completely different yet similar in a way
For example think of one of your earliest memories; taste, touch ,sound etc.
The boy or girl that existed then is different from the adult that exists now: every single atom in the body has changed.
What makes it even more remarkable is that you are in essence remembering another persons memories.

Answer 4

if i remember correctly...millions of years