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What is the general rule for saying, for example, "2 hours later"?

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Should be: [二時間後]{にじかんご} – fefe Jan 19 '12 at 16:20
I agree, but any particular reason you added this as a comment and not an answer? – NattyBumppo Jan 19 '12 at 17:35
@NattyBumppo It is too short. The system won't let me submit as an answer. – fefe Jan 19 '12 at 21:14
@fefe Just pad the answer with extra explanation – atlantiza Jan 19 '12 at 23:05
See also japanese.stackexchange.com/questions/4549/… – cypher Feb 8 '12 at 3:12

As fefe wrote, you add the portion of time + 後 or you can write 後 + the portion of time.

二時間後: 2 hours later (it is then read にじかんご)
後二時間: 2 hours "left" (it is here read あとにじかん)
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二週間後 (~~後(あと)or(ご))

Just substitute ~~ with any unit of time.



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