We will eat in an hour's time/after an hour, " Nous mangerons dans une heure/apres une heure. "
If so, saying this would make the lesson easier to grasp, because dans and en mean practically the same thing when en means in in my head.
Dépêche-toi, on va manger dans 5 minutes. -- Hurry up, we are going to eat in 5 minutes.
This sentence wouldn't really work with après, just as in English you wouldn't really say, "we'll eat after 5 minutes."
You are right that dans and en come close in meaning but they aren't really interchangable.
-- Chris (not a native speaker).
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