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.
I have just checked in a cloned version of your form, and I was able to edit the Time to Live option. Please make sure that you are clicking on all of the Save buttons after editing the value.
First, go to Setup & Embed > Preferences > Advanced Settings > Edit Auto Fill Settings (steps 1 to 4).
In the popup that opens, I have successfully changed the Time To Live to 10 hours (step 5), and clicked Save (step 6).
After that, please click Save again on the main form (step 7), so that all these changes are saved.
Please confirm if the above presented steps are working for you, and if you are able to edit your Auto Fill settings this way.