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"I'll be back in a week" means "I'll be back after a week has passed" or "I'll be back after the next seven day's period is over".

I was very much wondering if "I'll be back after a week" is also valid. I've done a ton of research only to fail to come up with any answers.

If it is, does the "after a week" version mean just about the same thing as the "in a week" version? Are they, I mean, interchangeable?

Or does the "after a week" version have a slightly different meaning, like "I'll only be back after a week has passed" or "I won't be back until a week has passed"?

Or is it just that few English speakers have chosen to use it irregardless of its being perfectly grammatical as well as logical?

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In a week means exactly after a one-week period, except in those cases where "a week" is being used an approximate time period.

After a week could mean more than a one-week period.

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I do not think there is any difference between in or after a week.

I will be back in a week

I will be back after a week

Both the sentences mean that he will come after the completion of a week.

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