Final answer:
If you state the information "The task will take three hours to complete" in a new document, it should be marked as Unclassified.
Step-by-step explanation:
If you state the information "The task will take three hours to complete" in a new document, it should be marked as Unclassified. The Security Classification Guide (SCG) states that this information is classified as Secret. According to the SCG, anything classified as Secret should be marked as Unclassified in a new document.