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I'm trying to learn how to use 'entire duration/duration'

I'm kind of busy now. Call me back in an hour and I'll explain to your for the entire duration of me walking my dog.

Just let me take tomorrow off and I promise when I come back, I'll work hard for the entire duration of the project.

She screamed in pain the entire duration she was in the bathroom. That's how serious her constipation is

Are my uses of entire duration correct? I feel that the phrase must be preceded with 'for' though I omitted it in the last example for reason I don't know.

Also, please correct any mistakes.

Thank you!
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Entire duration is redundant. The duration = the entire time.
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She screamed in pain the entire duration she was in the bathroom.

Duration is usually used, as you have done in the other sentences, with 'of ......'. In this case you should say the entire time.
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Hi MM, If I remove 'entire', are my sentences correct?
 Philip's reply was promoted to an answer.
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Hi Philip, what's the difference between entire time and duration?