When creating or editing a line item, click Allow grace period and enter the number of days by which you'd like to extend the line item's end date. You can enter as many as 7 days.
How the grace period works
When the initial end date is reached, the line item's status will change to 'Delivery extended'. This means the extension period has started and your line item will serve as fast as possible.
If the line item doesn't reach its goal by the end of the extended delivery period, it will stop serving.