Firstly navigate to your surveys list by selecting ‘Survey & Polls’ from the menu and then selecting the available ‘View’ option. You will be present with a list view of all the surveys that you & colleagues with the same permissions have created.

Hovering over the icon highlighted above, will show the tool-tip 'Change Expiry Date'. Click on this icon.

You will see the following popup where you will be able to change the expiry date

After changing the date click ‘Update’ to save changes. That's it, the survey expiry date will automatically update for all survey recipients.
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