submit on a form

I have an email that I am sending to users. In it a user clicks on a link which brings them to http://localhost/index.php/Configure/MyFormEmployee which is a function in my controller that displays a survey.  They fill out the form and hit "submit" which brings them to http://localhost/index.php/Configure/survey_results which is another function in my controller. In survey_results() I will total up the survey and write the results to a mysql table. Ignore the "localhost" implications since that is just for testing. 

But what happens if the user of the CI application is no longer running the application? Since this survey invitation is sent via email and the receiver has 48 hours to fill out a survey there is a very good chance that they will no longer be running the application. Will the survey results function still run? 

proof that an old dog can learn new tricks