The duration starts at the time a guest first fills out the form. That is, when they're at the iPad for the first time (or on their mobile, having selected the site for the first time) and enter their responses to a blank form.

The form pre-fill remains available for the duration set by the site admin. If a guest attempts to return check-in, Sine will present the visitor with their previous form responses.

When the guest attempts to return check-in and the duration has elapsed, Sine will not present the guest with their previous responses and the visitor will need to respond to the form again.