I agree with Ruthi as both sentences are correct.
We use until/till in the sense of 'time up to'.
e.g.
I waited for her until 12am, but she didn't come.
2015년 6월 1일
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Both are correct and you can also say I am free between 6pm and 9 pm
2015년 6월 1일
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"Which is the correct question?"
Both are correct, but neither is a question!
You should have asked "which is the correct statement?"