To limit the form to be submitted an specific amount of times (either in total or per user) do the following:
1.- Go to Settings/Restrictions and check “Limit the number of times the form can be submitted”
2.- Select a limit type
Limit total number of submissions: The form can be submitted a total of x times
Limit submission per user: Each user can submit the form x number of times
3.- Configure the maximum number of submission
4.- Define an error message, this error message is going to be show if the user try to view or submit a form that already reached the limit.