Reminder section

The Reminder section specifies whether the recipient of an action item should receive a reminder to complete the action item.

The fourth section of the form for user action task properties is labeled Reminder.

The field Send Reminder to Assignee has a dropdown list with these items in it:

Never: If this is selected, no reminder will be sent.
Before Estimated Due Date: If this is selected, a reminder will be sent a specified amount of time before the action item is due.
After Estimated Due Date: If this is selected, a reminder will be sent a specified amount of time after the action item is due.

Under the Send Reminder to Assignee field is a field labeled Expected Time to Complete. This is not what it sounds like. It is the amount of time before or after the action item is due that a reminder should be sent if the action item is not completed.