pfSense

When adding "Pass-through credits per MAC address.", there is no inputbox to insert the "waiting period".
When saving we get the error:
The following input errors were detected:
The waiting period to restore pass-through credits must be above 0 hours.

For debug purpose I chnage the page submission @Browser level, adding the post variable $_POST['freelogins_resettimeout'] = 10.
After that the Save buttons works with no error message.