How to remove timer in quiz?

I have 10 graded questions in an end of module quiz. After 10 minutes of having started the quiz, the learner is disallowed to continue replying to the quiz questions. How to I undo the timer? And how do I undo this efficiently for all 10 slides of 1 question each? The questions are a combination of multiple choice, fill in the blanks and T/F.

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