By default, expiration notifications will be sent once per day for up to seven days before the listing expires. If you set the number to more than seven, a notification will be sent once on the specified day, and then once per day starting a week before the listing expires.

If an existing listing will expire sooner than the time frame that you set here, notifications will not be sent. For example, if you turn on this setting and set it to seven days, a listing that expires in six days will not generate a notification.