Can I reset the time for when a user can submit a second form?

There's no feature that allows you to enable the form by schedule, but there's a workaround.

1). Create a date field and set it to hidden

2). Set the date field to "Current"

3). Create a condition that if Date is equals to your preferred date, show the following fields, otherwise, it will show a message using the paragraph field.

Here's a sample screencast:

I hope this helps. Let us know if you have any questions or if you need further assistance.