Schedule a thank you email

Hi, how do I schedule a thank you message to go out each time someone completes a survey. For example, if 5 have completed it so far - i can send them a thank you note. But, I want it to be so I don't have to do it each time someone completes it. I want to automate it so the note is sent out automatically. I tried the schedule thank you note but, it seems that I would need to do it each time. And, I don't want to wait until the end of the survey fielding to send the notes - I want them going out right away.