To disable access to a survey, go to:
Note: Closing a survey will only restrict access to the survey. This does not affect data or reporting in any way. To activate the survey again,, set the Survey Status to Active.
Can the survey be deactivated automatically on a certain date?
Yes. Select the option Enter Survey Close Date and enter the date in the Close Date field in MM/DD/YYYY format or select the date by clicking on the calendar icon. The survey will close exactly at 12:00AM PST on the set date. So if you set the date as 10/05/2011, respondents will be able to take the survey until 11:59PM PST on 09/05/2011.