Is this sentence OK?
"I just saw him in the park. He can't come back for at least half an hour."
I'm not sure if the word "for" is correct in this sentence and if the position of the words "at least" comes before the number "half an hour".
Thank you!
All is well with your sentence.
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I just saw him in the park. He can't come back [ for at least half an hour ].
Yes, it's fine.
If you're interested in the grammar, the bracketed PP (preposition phrase) is an adjunct in clause structure. Within the PP is the underlined NP (noun phrase) "at least half an hour", which has "hour" as head, "an" as determi