Can I change "in eight hours" to "after eight hours"? Does the meaning stay the same?

Native speaker’s answer

Rebecca

Unfortunately, "after eight hours" by itself can't be used because it is not specific enough. The phrase "in eight hours" means "after eight hours from now". Only using "after eight hours" could refer to that eight-hour time frame beginning at any time. An example of how you could use the phrase "after eight hours" is, "After eight hours of sleep, I feel refreshed."

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