Which one is correct?"How long have you been waiting?" or "For how long have you been waititng?"

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I would probably say "How long have you been waiting for?" or "How long have you been waiting?". 
The other sentence sounds old fashioned.

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"How long have you been waiting?" is the right way to say.

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"How long have you been waiting?" Is the best way to say it.

I agree. "for how long have you been waiting ?" is pretty old fashioned.

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how long have you been waiting? i've been waiting for two hours.
i've been waiting for a long time.

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