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I understan "I'll be there in an hour." is a correct sentence, but if I make the sentence to "I'll be there one hour later." is that correct? and same meaning?
if not, why is it incorrect?
i'm wondering if i can use "five minutes later or one hour later" instead of in five minutes or in an hour" when i make future sentences.
like I'll be back in an hour, I'll come back in five minutes.

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  • I google-checked "there an hour later", and got only 420 results. For "be there an hour later" or "be there one hour later", only a couple dozen results. This expression seems untypical for some reason. – CowperKettle Nov 12 '15 at 9:14
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    I'm trying to understand why you want to use the word "later". For me, "later" must be used in reference to some other mentioned time. – JMB Nov 12 '15 at 9:38
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    @CopperKettle - I believe the word "untypical" is, er, atypical... ngrams – AndyT Nov 12 '15 at 15:51
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"I'll be there in an hour" denotes arrival in one hour from the time the words are said. "An hour" is also generally used to be a bit vague, whereas "I'll be there in one hour" is generally used to be more specific. Either way, the clock starts from the time it's stated.

"I'll be there one hour later" implies that it will be later than something, i.e. one hour later than already agreed. If you'd agreed to meet at 15:00, this means you'll be arriving at 16:00 instead. You could say "I'll be an hour late" to convey a similar meaning.

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    "Tiffany will arrive at the agreed location at two o'clock. I'll be there one hour later." – nekomatic Nov 12 '15 at 13:42
  • Similar case, where it's later than a specified time. – Andrew Lott Nov 12 '15 at 13:44
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    Or relative to some other time in context like say: "I can't leave with until I get this task done. I'll be there an hour later." – shawnt00 Nov 12 '15 at 14:02

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