You can configure starting and ending point of collecting responses.
If you don't make any configurations, the response collection begins when you press 'Start collecting responses' and responses will be collected until the author ends the survey. When the starting point is set at time earlier than the present, response collection will start when you press 'Start response collection' button. If the starting point is set up at later time, response collection will begin automatically at the set time.
You can configure starting and ending point of collecting responses up to unit of minutes. Once response collection starts, you can only edit the ending point.
You can end the survey by limiting the number of responses. The survey ends by whichever condition is met first between ending point or number of responses. You can't edit number of responses lower than current number of responses.