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About a million years.

The reasoning:

As energy is produced, photons are emitted and they are free to travel. Unfortunately, there are also billions of other photons doing the same thing. they collide and are deflected, sometimes upwards, downwards, even sideways. There is no straight path. It's a random event, which is why no real true figure is available.

It's a bit like being placed in a forest, blindfolded and your hands are tied. As you wander about, you hit a tree and move around it, but another tree is in your way. You have no idea of direction so you just wander around bumping into trees. As you bumble, given enough time, you will eventually exit the forest and freedom, but it takes a long time.

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14y ago

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