What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
Unfortunately, we do not have such feature. There is currently no feature to meet your requirement of enforce restriction of multiple submissions per day per user. The feature we have currently, allows you to restrict multiple submissions from one user. The following guide should help you: http://www.jotform.com/help/64-How-to-Set-Unique-Submissions-on-a-Form
Do get back to us if you want us to send a feature request ticket to our back end team.