To moderate a quiz with extra time and attempts:
Step 2: In the Course Navigation, click or tap Quizzes.
Step 3: Click or tap a quiz link.
Step 4: In the Sidebar click or tap the Moderate This Quiz link.
Step 5: Click or tap the checkbox for the selected student(s).
Step 6: Click or tap the Change Extension for Selected Students button at the bottom of the list or Click or tap the pencil icon to the right of the student's name. 
Step 7: Click or tap the Extra Attempts textbox or the Extra Time textbox, then type a numerical value. 
Note: The Extra Time option is only available when a Time Limit has been set in the Quiz Settings.

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1 comment
I will try this to see how it goes.
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