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The answer depends on a lot of variables and there is no specific answer to an completely unqualified question. And no general answer will be of any value because the range of possibilities is so large and even then how much do edge cases matter.
CD keys can last as long as the administrator of those keys is functioning and doesn't put particular limits on them. Decades potentially. However CD keys for completely defunct products may only last while the product is viable/available. And that may vary from service to service platform to platform product to product. There's no specific answer.
You can redeem a key on a web browser here https://store.steampowered.com/account/registerkey you don't need a PC explicitly.
Although I don't expect waiting would be an issue.
they are added to steam library
even a game is pulled from steam store in the future, you will still be able to play it