How to change quiz timing
Log into your account and navigate to your CDX home page. From the navigation on the left, click the course with the quiz you would like to change settings for. Then, find and click on the quiz.
On the next page, click the gear icon in the upper right corner. Then, select Edit Settings.
Under the Timing heading, you can change the open and close dates of the quiz and set a time limit. Once you have finished, click Save and Display at the bottom of the page.