Only the first one is correct. ".
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BarbaraPAOr "a walk of ten minutes."I'd use "ten-minute walk" myself.It was a ten minutes' walk to the park. (This sentence is incorrect.)
tamguatlayI'd use "ten-minute walk" myself. (The "a" is not needed.)It is needed in this case. Say "a ten-minute walk" or "ten minutes' walk" (no article).