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How long does it take for a typical star that has no more hydrogen to become a red giant?

Answer 1

It will go until it reaches iron.

Larger and brighter stars burn through their fuel more quickly than smaller stars. A star will fuse hydrogen into helium, which will then fuse into the next element on the periodic table, and so on, until it reaches iron. Iron is too heavy to fuse, so it will collect in the core.

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Answer 2

Alexander Acosta

It takes a typical star anywhere from a few hundred million to a billion years to transform into a red giant after it runs out of hydrogen fuel.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.